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A commonly used term for a crazy girl. When you are having sex with her and you are about to climax, instead of letting you pull out she locks her legs around you in an attempt to have you ejaculate inside of her.
Jeffrey: Hey bro I think I'm gonna ask Cynthia out on a date.

Ricardo: No dude steer clear from that she's a leg locker!
Jeffrey: Dude you're right she said she does jiu jitsu!
by Salsa<3 December 19, 2015
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