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1.
The clam is feared in all countries world wide. The clam is when your parter's vagina becomes a certain age and becomes hard/crispy and dry.
Mary got THE CLAM for her birthday :'(
by SHENZILLA December 14, 2010
 
2.
Chlamydia, the STD transmitted through sexual intercourse,i.e. genital copulation. It is a bacterial infection that should recieve medical attention immediately and can cause numerous problems in women and men alike.
Slut 1: Oh Betty, I got the Clam!
Betty: Ahahahaha, that sucks slut.
by The Informer (for your health) December 26, 2007
 
3.
a common nickname for the std properly known as chlamydia.
Bob fully intended on sleeping with Sue until he found out she had the clam.
by effyxstonem April 19, 2009