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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"
by Empress R October 31, 2007
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GTB means Golden Thief Bug in Ragnarok Online.It's a MVP boss in Ragnarok Online. Can be found in underground tunnel level 4 near Prontera city.
Hey mate, lets go to pawn GTB the MVP. I think its right in time before somebody else got it.
by alan woo June 19, 2008
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Rachel: it’s getting late i don’t know how much longer i’m gonna stay up.
Micheal: so might as well gtb if you’re tired we can talk tomorrow.
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