Top Definition
When a man stretches out his scrotum sack and bounces his penis off it like a monkey jumping on a trampoline. This technique was created by two brothers from Mass.
Jack loves playing with his sack, his favorite manuver is the monkey on a trapoline.
#playing #balls #sack #scrotum #bouncing monkey #the goat
by Bro#2 January 12, 2006
6 Words related to monkey on a trapoline
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