Definition from Wiktionary, the free dictionary
- (Internet, gaming slang) Initialism of good game.
- (Internet, gaming slang, by extension) loss, defeat, game over
2014 March 19, Free to Play:
- Nature's Prophet going to get the last hit in as well. It's the entire team down for EHOME. This is GG.
- (slang) Initialism of good going. may be used genuinely or sarcastically.