21st base 

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.

21st base by Compulsive Gambler July 16, 2010

21st base 

when you proced to have 69 with your partner's toes

My Girlfriend Likes To Go To 21st base

21st base by EAXSWC September 24, 2006

21st base 

Giving yourself a blow job. Then your penis blows up. And then the world blows up. And a penis takes its place.

Friend Isn't that just 20th base but extreme?

Me:Fuck yeah it is. 21st base is better though.

21st base by Please. Stop. April 4, 2017