when you stretch your nut sac out as far as it will go, and then you begin flapping your scrotum sac up and down. Your penis will then bounce off your sac as if it were jumping on a trampoline.
by Tea Baggs August 05, 2006
The act of spreading your scrotum to form a flat surface like a Trampoline and then bouncing your flacid penis like a squirrel bouncing on a trampoline.
by Haught Carl December 18, 2009