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3.
Used to define a loss of a battle, game, or argument. Could be seen as an insult, as gg represents good game, no re represents no remake or redo, and k thx is alright, thanks. Most likely done to repress any counterattack from the opponent.
k nubz, no re k thx plz gg? k more sad? gg plz leave now, haha n00bz
by Bryan Le July 25, 2004
 
1.
A popular Battle.net expression used to denote a substantial victory followed by no rematch. Often given before the fact in error. Literally: good game, no rematch, thanks
OMFG I TOTALLY PWNED j00!!! GG NO RE THX
by marK July 03, 2003
 
2.
GGNOREKTHX originated from a game called WarcraftIII.

GGNOREKTHX is an abbreviation meaning
Good Game No Remake OKay
ThanksThx

It is used as an enhancement to words such as 'pwned' or 'owned'. The phrase itself means that one has defeated another in a game, and declares that there will be no rematch, and concludes with 'okay, thanks for the win'
"HAHHAHA PWNED GGNOREKTHX NOOB"
or
"dboss you noob ggnorekthx"
or
"zediabolical u sux ggnorekthx"
by XiaOLiN- December 09, 2004