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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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 act of meeting up with friends at Lake George for a weekend of fun filled activities including Log Bay Day (getting stoopid drunk at Log Bay ((the great Barrier Reef outskirting the beautiful confines of Lake Jorge) in your boats that line up with other boats so you can make boat alleys where you meet new friends and hopefully get their clams). Preceding that is a fun filled concert with a preset band every year. You also get very drunk here is well. Throughout the weekend you try to stay off alcohol for a little bit so you can eat food every once in a while.
Dre: Hey, I can't wait to see the new Clam Jam '012 jersies for this year

Tad: Ya, there gunna be Rad!!!!
by thepet2123 April 20, 2012

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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 03, 2009

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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 13, 2008

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When a female has two cocks in her vagina at the same time.
Mike and Joe were fucking me last night and clam jammed my pussy.
by Dusty225 June 09, 2008

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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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