Short form for an insult popularized by the movie mean girls, "gap-toothed bitch".
"She's a gap-toothed bitch, a real GTB"
"She was being really rude on the phone, so I just called her a GTB and hung up"
"That GTB has got nothin' on me"
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AWW YAHH, I just got paid so i'm rollin' with a wad of green queens and I'm ready to paint the town!
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