Definitions by Weak Saucer

The Trampoline 

Where you extend the foreskin of your nutsack to form a "trampoline" and you bounce your penis off it creating the effect of a trampoline.

Guy 1: Hey dude, check this out
Guy 2: Ohhhh man... wtf
Guy 3: THE TRAMPOLINE!

The Trampoline by Weak Saucer November 29, 2007