1. n. money. I don’t have the jack for a deal like that.
2. n. tobacco for rolling cigarettes. You got some jack I can bum?
3. n. nothing. (Probably from jack-shit.) Your last idea wasn’t worth jack. Do I pay you to come up with stuff that bad?
4. n. a strange person; an annoying person. (Possibly from jackass or jack-shit.) Willy, stop acting like such a jack!
5. tv. to steal something. I didn’t buy it, I jacked it!