Top Definition
When one thinks it would be funny if they jacked off while playing blackjack. Everyone else in the semicircle must take your sweating, shaking, and grunting as a sign of having a bad hand.
Gambler: What's that guy's problem?
Other Gambler: Either he just stayed with eight, or he's just hit 21st base.
by Compulsive Gambler July 16, 2010
when you proced to have 69 with your partner's toes
My Girlfriend Likes To Go To 21st base
by EAXSWC September 23, 2006
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