It's mostly used in context for "good game."

But it can also be used as slang for "good job," which is usually done in a sarcastic way.
"I didn't do the homework, oh shit!"

"Wow, gg."
by MonsterDino April 22, 2016
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Gauthier Gidel, The God of Game Theory
Who is a well Known professor at University de Montreal
GG taught IFT6758
by 332299 December 25, 2021
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"Goodness Gracious", an exclamation of surprise for an unexpected situation.
A: I just lost all my money at the casino
B: GG
by Faterie October 15, 2022
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When the phrase said at the end of a bad game by the WINNERS, it usually means "Goodbye Garbage."
*Blue team wins, 100 to 0*

Blue Team: GG
Purple Team: TY
by nakoruru July 9, 2012
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In the computer game, Diablo 2, gg refers to Godly Gear. Namely, rare items (or glitched/bugged items) that have desirable modifications on them. The specific combination of mods on them that are extremely rare to come by makes an item gg.
gg items 4 hrs (trading godly gear for high runes)

eth bugged armor (double defense bug) is a gg item.
by Michaelangel007 March 16, 2010
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1) Good Game; used at the end of a match/round in an online game for a show of good sportsmanship
2)Good Game; used during a match as a remark of sarcasm (i.e; the match was over before it even began)
3)Get Good; It's used condescendingly towards players who would be considered bad by the person using 'gg' in such a way.
1) GG guys! Had lots of fun
2)*After a run of loses on one side* Man you guys are way to good, GG no rematch
3)*After one player has repeatedly killed another* gg scrub, hope your mommy buys you some skill for Christmas next year
by PulchraMors January 1, 2015
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