A black woman's vagina. Black on the outside and purple on the inside.
I encountered my first purple clam the other day. Her name was Bonquicia.
by bubba1351451 October 29, 2009
No we have an opposite of blue balls... Purple clam. Girl's get to have a phrase for being horney, desperate, pissed off for not getting laid, and having sexual frustration.
Hey girlfriend, how was your night? Oh it was terrible after not getting any I totally got purple clam.
by Kiss2113 April 21, 2012