Used by students to express failure. Originating from "Good Game" of playing Online Games, students use "GG" (instead of "Game Over") to showthat kind of "Oh-it's-the-end-of-the-world-but-who-cares" emotion.
Also Look Up: QED
Student A: Hey dude, how did you do on your Probablity test?
Student B: Oh I just GG-ed...