Meaning Gotta go
Type Acronym
Rank ★ ★ ★  Common
Usage Online Only (chat, messaging, e-mail)
Comments The less grammatically correct version of, "I have to go;" commonly used in online chat; also written GTG.
Updated January 30, 2013
Meaning Good to go
Type Acronym
Rank ★ ★ ☆  Average
Usage General (not just online)
Comments Means everything is OK and ready to go. Also used in the Marines.
Updated November 6, 2013