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This occurs when your girlfriend cheats on you with another girl. She may tell you it doesn't count because it's just a girl, but realistically, she's getting off with someone besides you.

This may include kissing, rubbing(scissoring), licking, sharing a dildo or vibrator, masturbating for each other or masturbating to each other masturbating.
Brian: "I caught my girl cheating with another girl."

Jimmy: "Damn, and you dumped her?"

Brian: "Hell yeah. She tried to tell me it's just a girl! but honestly, she was having intimate relations with another person..."

Jimmy: "Yeah I know what you mean, that's messed up."
by XBF4EVERDECK March 15, 2010
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