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1.
It is an acronym that usually refers to the phrase "GOTTA TAKE A DUMP". This is only used in an emergency when you can no longer hold in your dump, and you do not have the time to write the entire phrase.
xxgirliedawgyeah: Hey girl whats up?
fiberbars4lyfe: BRB GTAD!
by XokarymateoX May 10, 2009
 
2.
The act of getting beat up, robbed, smoked, run over, jacked, knocked out, etc like in the video game Grand Theft Auto
Yo this fool tried to run up on the set and I GTA'd that mark ass trick.
by Bee Ohh Bee October 08, 2013