Trampolining

[Monty]

(v.) the act of holding a shirt over ones genitals whilst whipping ones 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]

[Britney]

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 shes in the air. When a girl has trampolined 10 guys, she gets a Silly band

[Sommer]

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.

[Kit]

The activity or sport of doing acrobatic or gymnastic exercises on a trampoline.

[Gregory]

the sport or activity of performing physical exercises on a trampoline (= a piece of sports equipment that you jump up and down on) :

[PussyCat]

Jumping on [the trampoline]
Honestly, this was a dare from my friend who was [FaceTiming] me and she said Are you still [trampolining]? When I was on the trampoline and I was like thats not a word and so she told me to put it in the Urban dictionary.