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2.
blackjack the card game
Twenty-one is also called blackjack.
by Ed April 05, 2005
 
1.
Twenty one inch diameter wheels or rims, on luxury cars.
I got twenty ones rubbing on my Benz.
by Jack December 28, 2003
 
3.
noun: a telephone call; verb trans: to give someone a phone call. From police code 10-21, originally meaning request for contact by phone.
1. Yo son gimme a twentyone.
2. I'ma twentyone y'all later.
by Grandmaster Vinny B November 02, 2005