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1.
(v.) the act of holding a shirt over ones genitals whilst whipping one's hips and external genitalia in the direction of said shirt, thereby creating the effect in the shirt that is seen on the underside of a trampoline when teenagers jump on it
Jeph, in a celebratory action, pulled down his pants, held his Chrebet jersey taught over his genitalia, trampolining it in front of everyone watching the game.
by Poundtowner January 17, 2010
 
2.
Something that SNL made up: Boys sit on a one story roof, while a girl jumps up and down on a trampoline and gives him head while she's in the air. When a girl has trampolined 10 guys, she gets a Silly band
did you see SNL last night, with the skit with the trampolining and souping? we should do that
by SarafinaImelza December 25, 2010
 
3.
A male sits on the roof of a one story house while receiving oral sex from a female jumping on a trampoline. When a female trampolines 10 males she receives a bracelet. Alas, the silly band was formed.
She was just trampolining Colton!

No wonder she has so many fluffy dolphins!
by SamF104 December 25, 2010
 
4.
(v.) The act of jumping on a trampoline

Also known as "to trampoline"
I'll get better at trampolining eventually...
by Samel Camel October 16, 2011