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29 comments on this post.
  1. bluejay:

    My first thought on reading of the Australian term “Jacks” for police, was “Union Jack.” I’m not Australian, but I thought perhaps there was a time when those who enforced the law were either seen as (possibly resented) agents of England, or wore the British flag on their persons somewhere.

  2. daughton:

    I don’t speak French, but isn’t “Jacques” the French equivalent of “James” (Jacob)? Isn’t “Jean” the French equivalent of “John”?

  3. RolyMole:

    ‘”jacks” as slang for “police” is indeed common in the UK’ – I don’t think so!

  4. Greg:

    Yep, what RolyMole said. I have NEVER heard the term ‘Jacks’ used in the UK in all my 33 years, and I’ve lived all over. Piffle.

  5. Chris:

    Greg, I’d never heard of the term Jack being referred as police in Australia, but I don’t keep company with criminals.
    So unless you are a criminal or associate with them, how can you be sure?

  6. Peter:

    The popular Australian television show “Underbelly” which details the gang wars in Melbourne from 1995 to 2004 uses the term “jacks” very frequently as a replacement for police. I’m Australian and hadn’t heard this term previously, though obviously the writers who researched the organised crime syndicates must think that its common amongst these groups.

  7. Tanya:

    Maybe it is a regional thing…Until I moved to melbourne, Victoria (heidelberg to be exact) I had never heard the term ‘Jacks’. It is used in almost every conversation I have heard when people are referring the the Police.

    I had asked a friend to explain what it meant and she could only tell me thats what she grew up calling the police. Certainly not a new word…….I think it is probably due to location.
    Ps. I dont hang out with criminals (well none that have revealed themselves to me!! LOL!) You only have to have your ears open to hear things that might surprise you!!

  8. JJ:

    I was in the Victoria Police in the 90’s and pretty much all criminals referred to us as “the Jacks”. It was always used in a derogatory way and at the time I thought it to be related to use of “the Jack” to refer to a sexual disease as per the AC/DC song “The Jack”.

  9. All wrong:

    It is a US term. It’s because in the US they wore standard military jack boots

  10. John:

    The Australian Military Police, MP’s, or Provost Corps were known as the Jacks as early as WWI. Perhaps because of the slang Lance-Jack rank but I suggest the John Darme, gendarme, theory is most likely. Especially when you consider thousands and thousands of off-duty Aussie troops would have had a lot to do with the gendarmes during WWI.

  11. Tomm:

    i think its short for jackass

  12. poll:

    “Jacques” the French equivalent of “James” (Jacob)? Isn’t “Jean” the French equivalent of “John” , No i don’t think so , but would be interesting to think about it

  13. Evan:

    In the U.S., one frequently hears the term ‘Jake’ used to refer to a police officer, especially in the speech of urban minorities. One could find a million examples in the albums of rappers from across the country. Similarly, the word ‘Johnnies’ is used by some, especially in the Midwest.

  14. Clem:

    Its certainly used in melbourne. I’m a criminal lawyer and all our clients use this term. I’d never heard it before. Don’t think it’s common outside crim circles!

  15. Grill Gambit:

    Thanks for your most informative article on the use of the term Jack to refer to coppers. It is, I can assure you, the term of choice of evildoers within this wide brown land. Coppers is #2.

    John Darme. LOL. A scream.

    And Jack as an STI is short for Jack in the Box = Pox. Jack is sometimes used to mean jack Dancer = Cancer but I prefer Spanish = Spanish Dancer. Spanish, btw is used in the car game to mean Rust. Rust = Cancer = Spanish Dancer.

    BTW Jack as Copper is popular not only with crooks but with the poor in general. West Heidelberg is a perfect place to find it in use.

  16. Steve:

    Police officers in Merseyside (Liverpool, England) describe the CID as “Jacks”, it’s neither derogatory (unless prefixed with fat or lazy of course) nor a compliment but simply a label. I’ve heard several explanations such as “jack of all trades” based on multi-skills, “jack the lads” based on drinking culture, and even “jumping jacks” which didn’t have an explanation. I don’t buy into any of those and find the reference in the article to plain clothes officers drinking in a pub being exposed as an interesting and likely theory. I’ve given up hope on getting to the bottom of this question and like otherEnglish references on here, it’s not common in England, it only appears to be Merseyside that uses it and it’s the officers that use the term internally, not the public (criminal or otherwise).

  17. James:

    Okay, so im 16 and live in the south east suburbs of Victoria, and the main terms ive heard for cops lately are ‘pigs’ and ‘the jacks’, i dont know where it originated, but its a term to put down the police really, about 2 weeks back i was at a festival in warryndyte and a fight between two girls broke out and they were really getting violent, there was a massive crowd edging them on aswell, well when the cops came people yelled ‘the jacks!’ and everyone split, my mates and all the ‘rats’ in our area refer to the cops as ‘the jacks’ so its actually a very widely known term in the south eastern suburbs of Vic from my experience most notably the Maroondah and Knox areas.

  18. James:

    to add to that^
    …its also a term im only starting to here more of along with stuff like ‘lad’ but it may just be stupid slang that other kids have started saying randomly

  19. prawna:

    I’ve been using the term since i was in primary school and I am now 40. I also come from S.E Victoria like one of the earlier posts. I originally thought it was just Australians rebellious nature and used because we didn’t want to copy the UK and use “the old bill”. After a little bit of searching and thinking the “Jackboot theory” seemed the most plausible to me imho.

  20. bob:

    Jacks, I learnt it in inner Melbourne as a young lad as a reference to the cops
    @Steve, jumping jacks = a nasty little ant that packs a wallop of a sting in Oz, from the same family as Bull ants. I never really thought about were that little buggers common name came from but now, perhaps there is a connection between the two.. lol

  21. MrHistoricallyInaccurate:

    Jack is a pretty common term here. Jack Boots doesn’t fit as the term has been used since the jacks wore standard shoes, not the GP boots some of the units wear now (particularly the Dogs and Soggies). I grew up using the term Jack to refer to Coppers (named for the copper buttons worn by the lower ranks, the Top Brass had brass buttons) and am most definitely not a criminal. At a party as s youngster we would often hear someone yell “JACKS!!!” to let anyone under 18 to hide their grog as the cops had arrived.

    @James – Lad is being used in Austrslia more and more these days, in part due to our older generations using it and in part through the popularity of UK films such as Snatch, Lock Stock, Layer Cake & others. In these films the tough guy usually greets his mates with “Orright lads?”.

    Lad never went out in London and it’s made its way back into the Aussie (esp Mrlbourne) vernacular.

  22. Lady:

    @ Mr historically Inccurate –
    Lad isnt bein used in the way the English use it as for young men or replacing ‘mate’ which incedentally (sic?) is more often used for people one doesnt like than ones actual mates. Lad is a term used by what is best described as Australia’s version of chavs. Lads for boys and lasses for girls. Although I believe even though there would be a similar sub culture in each state that the ‘Lads & Lasses’ are a NSW thing and may be called something else elsewhere.

  23. Magpieranger:

    “Jacks” comes from Cockney rhyming slang.

    Old Bill = Jack ‘n’ Jill.

  24. Rod:

    The name Jack for police started in the gold fields when miners who didn’t have miners licenses would call out Jack when they saw the police coming to warn others to hide so that the police wouldn’t catch them without a license.

  25. Sokar:

    I grew up in the Sutherland Shire, in the southern suburbs of Sydney and was a legal clerk in Sydney during the mid-late 90s (the firm represented the most well known of Sydney criminals, including all of those in Underbelly: Golden Mile, and we worked on the Wood Royal Commission. The terms “Jack” for police and “Dee” for detective were VERY common regardless of anyone’s connection, or lack thereof, with criminals.

    As much as I love the gendarme explanation, even if it is a little shaky, I am inclined to agree with the above poster that sugggested Jack & Jill. I can also see the it being used in the goldfields (but that would qualify as an early reference and not really an explanation).

  26. Sean:

    I had a professional Psychologist refer to the police as “The Jacks”. I didn’t know what she was talking about until I found this site. Why in the world would she use such a word? I had never heard of it until then.

  27. Sean:

    And she was referring to “The Jacks” in a real nasty manner. After I explained that I threw a cup into my kitchen sink and it bounced up and broke the kitchen window. She said “Wouldn’t the Jacks love to hear that”. I am not a criminal, so why would she refer to the Police as “The Jacks”. I have been going through a lot of Psychological trauma since this was said to me years ago. What is going on here, really?


    It was my impression that “Jean” was the French equivalent of “John,” and that “Jacques,” deriving as it does from the Hebrew name “Jacob,” was the French equivalent of “James.”

    Further, in the UK at least, “Jack” is not a generic term for all police, but for plainclothes detectives (viz. the novels of former Yorkshire police officer John Wainwright and the TV series JACKS AND KNAVES).

  29. jean Elie:

    In Ireland going to the “Jacks” means going to the toilet.

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