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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.
"Have you ever seen a squirrel on a trampoline?" Then let the nut sac flapping begin!!!
by Tea Baggs August 05, 2006
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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.
At the party Jimbo surprised everyone by pulling out the Squirrel on a Trampoline trick and .
by Haught Carl December 18, 2009
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