1. (v.) When one female prevents another female from scoring on a professional and/or personal level.
2. (v.) Female equivalent of cock block.
Synonyms: Twat swat; clam dam; clam jam (not to be mistaken for rag).
I was just about to close the deal when she cut in, cut me off and clam slammed me so hard I got whiplash. So...I punched her in the vag.
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