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 27, 2011
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Clam Blocker • Clam Bake • clam jam • clam slam • clam chowder • clam slammer • clam baking • clam dam • clam hat • clam bumper