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

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lesbian
"Gee, I never would've guessed that Rosie O'Donnell was a clam bumper.", he said sarcastically.
โดย Mike Stander 01 สิงหาคม 2003

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Lesbian
"you two clam bumpers wanna be alone?"
โดย like2watch 01 สิงหาคม 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.
โดย leanna :) 07 เมษายน 2006

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The Urban Dictionary Mug

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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
โดย Cockmaster Bob 12 มกราคม 2004

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
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