This stands for “got to blast!”, which is a hip way to say that the person needs to leave.
hey how are u?

good hbu
good thx. miss u, but gtb!! time for dinner.
by thecoolest123456789 December 12, 2017
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An internet acronym which tells somebody you have "Got to Boost" on Modern Warfare 2 so you are to busy for them at the present moment.

(Similar to GTG "Got to Go")
Person 1: Hey, what's your dad like?
Person 2: No time to talk now, gtb!
by Jamal P. Rakens May 12, 2010
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"get that booty"
used to show your approval of someone getting ass.
"yo, is that your girl?? GTB bro!"

"dude, go talk to her, gtb cmon!"
by gtbgtb May 22, 2011
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My dad just tried to wash his hands in the toilet, he needs to gtb. tired, sleepy, out of it
by Jedi99z December 9, 2014
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Person 1- I'm so fucking tired.
Person 2- GTB.
Person 1- Alright.
by August Big Penis July 21, 2010
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Bob: I'm going to hang-out with Kate
Bill: oooh, GTB bro, get that butt
Bob: I will, she's hott
by cnsknk October 18, 2010
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