Whenever a male's spouse shoves one or both testicles down their own ass crack, causing either extreme pain or orgasmic pleasure.
My girlfriend and I were getting frisky last night and all the sudden she gave me the testicle crack. I usually hate it but this time it was pretty great.
A game played by males where 6 men take turns stomping on another man's testicles. There is no clear end to this game.
The 6 Step Shuffle is the reason I can't have kids.