A homosexual woman. (slander)
Man: "How did I know my girlfriend would run off with a clam bumper?"
додав Spud 27 Січня 2004
"Gee, I never would've guessed that Rosie O'Donnell was a clam bumper.", he said sarcastically.
додав Mike Stander 01 Серпня 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.
додав leanna :) 07 Квітня 2006