Definitions by Jamal P. Rakens

GTB 

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!

GTB by Jamal P. Rakens May 12, 2010