a vagina that is not clean shaven. one that has not been shaven for some time. rugged, greasy, out of control disgusting female pubic hair.
That girl's clam beard looks straight out of a 70's porn

I broke up with my girlfriend because she wouldn't shave her clam beard
by beej760 June 13, 2008
A woman's vagina.
Jessica: "I got the rub last night on my clambeard from that cavewoman."
by LVoigtA March 26, 2009

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