means good game but could also be used in the case of someone getting something useless in a game someone might say gg to be sarcastic
person one: i just got so much dirt in minecraft for some reason person two: gg
does not necessarily mean the person being referred to has a gay mom but is more of a easy insult that usable in any situation and can only be beat by no u or ur dad lesbian
bob: hey look its the retard joe joe: ur mom gay bob everyone: oooooooOooooooooOoooo
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