(n.) - the female version of a cock block; when a girl sabotages another girl's attempt to get some.
"This guy was hitting on me last night and asked me home, but Cara was being super clingy and made me leave with her instead; whatta clam jam!"
by garry larry July 1, 2013
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to keep a woman from getting laid, the female version of a cock block
Tina thought she had this guy at a party, but her friend completely clam jammed her by mentioning she was pregnant in front of him.
by Billheimer December 10, 2008
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The female version of the cock-block. Also known as box blocked
That coochie ran a clam jam on me
by MisoBored December 19, 2011
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The female version of a sausage fest. A gathering of only women.
We need some guys up in here. This is turning out to be a clam jam.
by poopsie1987 February 7, 2009
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one who prevents a female from scoring sexually.
Don't clam jam her, Christina is trying to hook up with him.
by Xtina1925 June 7, 2010
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The female equivalent of the cock block, but amongst two girls who'd like to get it on. A much more graphic term to use than box lock.
Trent is hanging out with a bunch of his lesbian friends at a bar. One of his friends' name is Lily.

Lily: That girl at the bar is so hot. I'm going to go hit on her.
Trent: No, I'm cranky. Let's go home.
Lily: Ok fine.

Trent has just clam jammed Lily.
by Candyce February 12, 2008
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Two women pressing their vaginas against each other.
I went to the strip joint last night and saw two chicks doing the clam jam
by I need a hobby March 2, 2005
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