1 definition by biff4tuna

Top Definition
When you smack your girlfriends ass during sex making it red. Usually gotten while having sex doggy-style. However, Baboon Butt can be gotten any time a female's ass is slapped making it a bright red color.
Dammit, Harold you smacked my ass too hard! You gave me baboon butt, again!
by biff4tuna June 27, 2011

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