The female version of a cockblock; When a female blocks another female friend from scoring a cute boy, due to jealousy or anger.
(Jane was talking to a cute boy at a party when her friend Karen walks up)
Karen: "Okay Jane it's time to go, I have to go home and feed my cat."
Jane: "Aww Karen quit being such a clam jam!"
by FckAllYall October 16, 2010
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The female equivalent of 'fromunda cheese'

Smegma
Girl: I haven't showered in a week, check out this clam jam!
by shakzilla February 17, 2011
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The creamy white discharge of cum and lubricants release from a woman's vagina after a bout of good sex.
Did you see the amount of clam jam coming from that ho!
by Capt Beyke October 24, 2018
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A woman's vaginal secretions, associating a woman's vagina to a clam, and the secretions that come out of it, being jam.
"man that broad I did last night had some thick ass clam jam."
by dudu September 17, 2003
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The female equivalent of the cock block, but amongst two girls who would 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 14, 2008
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The feminine version of sausage fest; a crowd where there is a higher percentage of women to men
"Damn, look at all those girls over there. What a real clam jam."
by onholiday6 November 4, 2009
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When one lesbian interferes between a lesbian trying to pursue another lesbian. The female form of cock blocking.
I would have gotten some pussy last night but this bitch was clam jamming me!
by Ryan and Ryan June 13, 2008
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