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Fabunchie is when you shove your whole face up someone's butt and hope they don't scream. It can also be a really big cock.
My cousin said he saw his uncle doing fabunchie in the park. It was like a horror movie.
She called him a fabunchie because he wouldn't stop showing off his penis at the party.
My mom said I was being a fabunchie when I tried to eat my brother's lunch.