Top Definition
A homosexual woman. (slander)
Man: "How did I know my girlfriend would run off with a clam bumper?"
Spudによって 2004年01月27日(火)

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lesbian
"Gee, I never would've guessed that Rosie O'Donnell was a clam bumper.", he said sarcastically.
Mike Standerによって 2003年08月01日(金)

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Lesbian
"you two clam bumpers wanna be alone?"
like2watchによって 2003年08月01日(金)

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One definition of lesbians, (clam meaning vagina) insisting that the two women have sex by rubbing one of their vaginas against the others vagina.
Cindy and Martha love eachother, they are probably clam bumpers.
leanna :)によって 2006年04月07日(金)

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Cassie Balleza from chowchilla that is really RANK. she smells like cottage cheese!!!!! shes a fat stupid bitch and often fucks sara merical, also a clam bumper who smokes oregano and thinks its bud!
Sarah and cassie fuck when they are together
Cockmaster Bobによって 2004年01月12日(月)

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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