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A girl who has absolutely no potential to be your long-term girlfriend but you want to stick it to anyway.

See: Future ex-girlfriend
Guy 1: Bro, i can't wait to hang out with you and my FXGF tomorrow.

Guy 2: Stop talking about my sister that way, asshole.
by Your FXBF November 08, 2012
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Jul 1 Word of the Day
sending two texts in a row without a reply inbetween.
Rachel: whats up?
Tessa: not to much! hbu?
Tessa: dude, i'm so bored.
Rachel: stop double texting me.
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