Definition of jack
jack 
noun
- a five pound note. Origin: Rhyming slang - Jack' alive.
Submitted by D. Fisher, London, Greater London, UK, Jun 01 1997.
- nothing, very little.
You don't know jack!
Submitted by Sue Clark, St Louis, MO, USA, Oct 27 1997.
- a cigarette.
Hey, could I get a jack?
Submitted by Aubrey Harrington, MD, USA, May 19 1998.
- a sweet, sensitive, adorable guy. Origin: Jack Dawson, the main male character in the movie Titanic.
He's a real Jack.
verb
- to stab.
- to punch.
He got jacked in the face.
Submitted by Karl Bartolome, Toronto, ON, Canada, Jun 06 1997.
- to steal or to be stolen.
I bet they jacked that watch.
My car got jacked.
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