Mouse on a trampoline 

When ones ball sack is stretched out like a trampoline while bouncing the mouse aka penis up and down off the trampoline

Hey man have you ever seen a mouse on a trampoline

Mouse on a trampoline by Butterfly85 January 10, 2018

squirrel on a trampoline 

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!!!

squirrel on a trampoline by Tea Baggs August 5, 2006

Mouse on a Trampoline 

The act of stretching one's scrotal skin and bouncing the penis repeatedly on it for a large audience, preferably unsuspecting churchgoers...or an elementary school.

The sermon was interrupted when a man stood and entertained the congregation for hours with his mouse on a trampoline.

Mouse on a Trampoline by Hi-Definition July 12, 2009

hedgehog on a trampoline 

It is a hedgehog on a trampoline
What did you expect?

Something nasty
Nope, just a regular ol' hedgehog on a trampoline.

Look Jesus Christ A hedgehog on a trampoline

hedgehog on a trampoline by Strawbert McCringlemilk November 22, 2017

Baby on a trampoline 

The act of pulling taught the scrotum in the "batwing" fashion and continuing to bounce one's flaccid small penis of said flap, thus creating the image of a baby jumping on a trampoline.

Hey....you ever seen a baby on a trampoline?
(pulls scrotum taught and bounces dingaling off it repeatedly) *everyone screams and gives a look of disgust...then they laugh.

Baby on a trampoline by DocCod November 6, 2015

bald headed mouse on a trampoline 

stretching one's scrotum forward and shaking it up and down so that the tip of the penis bounces on it

hey stuart, did you ever see a bald headed mouse on a trampoline?

bald headed mouse on a trampoline by madfunfrank September 30, 2013

Squirrel on a Trampoline 

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 .

Squirrel on a Trampoline by Haught Carl December 20, 2009