1 definition by Dr. Starf*cker

A single girl's friend, usually male, that prevents any other guys from flirting with her or asking her out - the female equivalent to the male term, cock blocker.
Hey girl, you should really stop going out with your friend, Greg. You'll never get any numbers cause he's a clam blocker!
by Dr. Starf*cker May 03, 2011

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