The wet trampoline 

When a pragenant woman expells crap and smears in in a curculatory motion on her stomach. The man then masturbates in side the "shit curcle" and slaps the pragenant belly.

Cindy even though you are preagnant I still find you attractive. Let me give you the wet trampoline

The wet trampoline by tramp dog May 17, 2008

Cincinnati Trampoline 

A variation of the trampoline, whereas the mouth of the participating female is defecated in and the male participant then proceeds to insert his penis into the inner cheek area in a trampoline fashion.

In a flash, Rick was performing the Cincinnati trampoline with Jean at the drive in theatre.

Cincinnati Trampoline by TickleMeNutsack November 12, 2010

Chin Trampoline

Slang for the ball sac, which acts as a trampoline for the chin toward the end stages of fellatio; helpful for adding momentum to the bobbing motion.

"I was sucking Roger's dick, and his Chin Trampoline came in really handy because he was taking forever to blow his load "

Chin Trampoline by putitinmybuttandcallmemama October 26, 2014

poo trampoline 

When one does a poo and doesn't want to make a splash one puts down some tissue paper to minimise embarrassment

'Hey man, I didn't hear you poo'

'Yeah man, I used a poo trampoline'

poo trampoline by Stegorubber January 19, 2017

reverse trampoline 

Sex move, Cowgirl based. The bottom thrusts repeatedly, bouncing the top up and down on them. Known as the reverse trampoline because the bottom (the trampoline) bounces the top.

"My girlfriend and I tried a reverse trampoline last night."

reverse trampoline by LunarLander August 6, 2017

undercover trampoline 

The act of stretching one's scrotal skin out with two hands - using thumb and forefinger - parallel to a primary surface (i.e. a bed or floor) until smooth, with the penis resting on top, utilizing the grip and taut skin to move the scrotum up and down at various speeds to have the penis bounce off of it continuously.

I’m going to go home and play undercover trampoline

undercover trampoline by MyNutsRSweaty January 23, 2019

man trampoline 

when having sex a girl is bouncing on a man

going up and down on a dick is a man trampoline

man trampoline by im your dad bobby December 5, 2019