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Singular: Noun: hip bones that protrude like knuckles when a girl is bent over; Most apparent on skinny girls.
During doggie-style sex, a woman's buttknuckles can diminish the sexual experience.
by pullon7 February 04, 2010
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1. Somebody with a mood disorder, such as Bipolar Disorder.

2. A person who is culturally and/or racially prejudiced.
1. My wife is a buttknuckle. She belongs in a mental hospital.

2. I ran into a couple of buttknuckles in the ghetto today. I saw them throwing beer bottles at a black person's house.
by JushtinSmeagol March 12, 2011
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The scienctifical term for the end of your butt bone.
I broke my buttknucle.
Uhh.. either i sat on a waterbottle or i just broke my buttknuckle.
by Rikki, Ryleigh June 22, 2009
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