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1.
A homosexual woman. (slander)
Man: "How did I know my girlfriend would run off with a clam bumper?"
by Spud January 27, 2004
67 15
 
2.
lesbian
"Gee, I never would've guessed that Rosie O'Donnell was a clam bumper.", he said sarcastically.
by Mike Stander August 01, 2003
57 26
 
3.
Lesbian
"you two clam bumpers wanna be alone?"
by like2watch August 01, 2003
31 15
 
4.
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.
by leanna :) April 07, 2006
15 11
 
5.
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
by Cockmaster Bob January 12, 2004
14 53