Top Definition
A homosexual woman. (slander)
Man: "How did I know my girlfriend would run off with a clam bumper?"
door Spud 27 januari 2004

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lesbian
"Gee, I never would've guessed that Rosie O'Donnell was a clam bumper.", he said sarcastically.
door Mike Stander 1 augustus 2003

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Lesbian
"you two clam bumpers wanna be alone?"
door like2watch 1 augustus 2003

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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.
door leanna :) 7 april 2006

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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
door Cockmaster Bob 12 januari 2004

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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