It is when a mail (or femile if they have a strap-on) lays there partner on their belly with their butt exposed and jumps in the air and slams their penis into their partners butt
Dude, my gf wanted to do something crazy last night, so I butt nuked her, it was awesome but painful
by KANT D3Ni April 20, 2017
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Get the Butt mug.The Tibetan Butt Trumpet is when you get ripped with your friends and only have enough cash for some Taco Bell. Whoever passes out first gets a kazoo shoved in their ass and you all laugh like maniacs when they start to fart humming squeezing noises.
Walt came over with s bottle of Jack and we all killed it doing shots. Mike Z passed out dead drunk after 23 shots and 7 1/2 bean burritos. Jackson shoved a kazoo in his asshole and within twenty minutes he was playing a symphony on the Tibetan Butt Trumpet
by Miltythecheese June 10, 2017
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