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Verb. Female equivalent to "cock-block." A clam or vagina is blocked from being entered; when intercourse is blocked from said female by her girlfriend(s), long term friend zone male, competing and less desired male, or act of god.
Still in the throes of post-break-up depression, Sally clam-blocked Becky at the party, so she wouldn't have to watch Gilmore Girls and cry into a bag of Dorritto flavored icecream alone.
by roadrunner23 November 30, 2014
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