G.G.T. - A promise that you'll be fine, but it's just another way of

A promise that you'll be fine, but it's just another way of saying you're gonna get in trouble.

G. G. T., I'll be back by lunch. (He was still there at dinner.)

G. G. T., No one will know. (The whole class knew.)

G. G. T., We'll get away with it. (They got caught.)