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the act of to women (lesbians or bi) having sex by bumping there vagina's against eachother.
dude, i caught my ex and my mom clam bumping last night
by juneaus November 06, 2004
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Sep 8 Word of the Day
A casual invitation / threat used by an individual that is not afraid of fucking someone up.
PAUL: I'm going to beat your ass.

JACK: Fuck around and find out, fool!
by NX STARCHILD October 16, 2020
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2
The illusory idea that homosexual women may have sex by bumping one female's vaginal labia against another female's vaginal labia. A slander. Other forms: clam bumper(s).
"Those dikey chicks are off to go clam bumping."
by Spud January 27, 2004
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