Bro#2's definitions
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.
by Bro#2 July 16, 2008
 Get the monkey on a trapolinemug.
Get the monkey on a trapolinemug.  Get the monkey on a trapolinemug.
Get the monkey on a trapolinemug.