A car roof that has been bent downward from children bouncing on it.
I've had to lower the price of my car on craigslist since the kids gave it trampoline roof.
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 "
slang term for a butt that i (kaylor) just invented
hamnd trampoline
:hand trampoline