A large mound of fat where the upper butt and lower back meet on a fat chick, often protruding, frequently causes wardrobe malfunctions and creates extra difficulty in finding any clothing that looks good on the butt muffin wearer.
Synonyms: Ghetto Bootie, Table Top Ass, Shelf Ass, and Badonkadonk
She's so fat she not only has a muffin top on the sides, she's even got a butt muffin.
Baby, you can rest your drink on my butt muffin if you'd like.
My jeans never fall down because my butt muffin holds them up.
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