(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 25, 2013

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 18, 2008

by MisoBored December 23, 2011

by poopsie1987 March 06, 2009

by Xtina1925 June 08, 2010

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.
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 January 12, 2009

by I need a hobby March 02, 2005
