A homosexual woman. (slander)
Man: "How did I know my girlfriend would run off with a clam bumper?"
από Spud 27 Ιανουάριος 2004
"Gee, I never would've guessed that Rosie O'Donnell was a clam bumper.", he said sarcastically.
από Mike Stander 1 Αύγουστος 2003
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.
από leanna :) 7 Απρίλιος 2006