J
- Bacon sandwich, or Jam sandwich
- UK, police traffic car, from the now largely obsolete historical colour-scheme – an overall white vehicle, with a longitudinal red, or red and yellow, stripe on each side. "Sambo" is a slang for sandwich. (Though this colour-scheme is dated. Most services have moved, or are in the process of moving, to checkered Battenburg markings.)
- Jack The Bag
- A notorious guard in West Limerick infamous for covering suspects face with a bag or pillowcase and beating them profusely with a phone book (yellow pages).
- Jacks
- A common term used for police in the UK and Australia, derived from "John Darme" a joking Anglicization of "gendarme" (French for police officer) and then – per common usage – John becomes Jack (or, in this case, the plural "Jacks").
- Jacks
- Cockney rhyming slang Old Bill, turned to Jack and Jill, turned to Jacks.
- Jake
- A common term used and created in New York City.
- Jepari
- A Finnish slang term for the police.
- Jeppe
- A contraction of the Finnish slang term "jepari".
- Job, The
- A reference amongst officers to being a member of a police force ("Don't shoot. I'm on the Job ....") or to the police department as an entity ("The Job said that officers would not be permitted to moonlight any more ...").
- John Q. Law or Johnny Law
- Used across the United States. Sometimes shortened to John or Johnny.
- Johnny Hopper
- Cockney rhyming slang for copper (q.v.)
- Jundanares, Jundos
- Caló (gyspy) for Spanish Guardia Civil.
- Jura
- Spanish slang term used by Mexicans mostly in California but is also used by other Hispanics in other parts of the world such as El Salvador.
Read more about this topic: List Of Police-related Slang Terms