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1.
a lesbian sex act which involves a certain mesure of flexibility. its rubbing and bumpung vaginas together
my dyke friends shave b4 bumping clams; man, i hope they dont get nether-beard burn!
by minghi May 17, 2003
 
2.
the act of rubbing the female clitoris together with another female clitoris
bumping clams refer to the opening of a clam shell, revieling the clam and bumping and grinding with another "clam" or clitoris until the friction generates a pearl....or an orgasm.....depends on whether we are talking clams or clitorises....
by the queen bee October 05, 2006