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hand trampoline 

slang term for a butt that i (kaylor) just invented
hand trampoline by ham trampiline February 1, 2021

Not A Trampoline 

If youre looking it up you know what it is
do you want to listen to not a trampoline
Not A Trampoline by IHeartLemonDemon September 10, 2022

Welch’s Trampoline 

While having a Threesome place one member lying on there back on the verge of diarrhea and place another mouth wide open infront of others butthole the third member will then jump on the stomach of the member laying down prompting them to shit uncontrollable in the others mouth completing a welch’s trampoline
Bro this girl from the bar last night was a freak we went back to her place and we did a welch’s trampoline with her roomate

Welch’s trampoline 

While In a Threesome have one member lying down on there back on the verge of diarrhea (should be watery and dark like welch’s cranberry juice) Place another member mouth open at the ass of the member laying down the final member should then be standing over the member lying down and when all parties are ready you will jump up and down on the stomach of the person laying down forcing them to shit uncontrollably into the other person mouth then completing the welch’s trampoline
These sisters i got with last night were mad freaky, we did a welch’s trampoline in the dorm room, almost broke the bed bro
The trait of not having a jawline. Your fat face droops down and makes it look like you're just a large blob of spray tan and toupes.
Angie: OMG that girl Sidney totally has a trumpline !

Sierra: TRUE
Trumpline by Memestealingwhore October 9, 2016

Tramampoline 

One of Homer's attempts at saying "trampoline". From The Simpsons.
The Simpsons are getting a tramampoline!
Tramampoline by sylvy September 23, 2006