Dr. Starf*cker's definitions
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
Get the Clam Blockermug.