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1.
GGXX is an abbreviation for good game times ten. XX represent times ten, where by the first x is the multipication symbol and the second X is the roman numeral ten.

GGXX is to further emphasize and magnify the effect of 'good game'. For the defintion of good game, please search it seperately.
Justin: OMG, I have a 30 page paper due tomorrow at noon and I have not even started yet!

John: GGXX, wish you all the best.
by Anderson Tanoto March 01, 2008
 
2.
Good game times ten. Often used after games of Fifa 2007, especially after consistently pwn-ing your friends day after day, night after night. Usually said in a provoking, taunting manner...
Wow Anderson, its 9-1 in injury time...GGXX BRO
Lost for the tenth time in a row to Arsenal...GGXX
Looks like I dangled ur ass, GGXX
GAY GOAL GGXX!!!!
Anderson...GGXX
by Mr. T. Henry March 04, 2008
 
3.
Good game times ten. Often used after games of Fifa 2007, especially after consistently pwn-ing your friends day after day, night after night. Usually said in a provoking, taunting manner...

*look up the Fifa definition of GG...
Wow Anderson, its 9-1 in injury time...GGXX BRO

Lost for the tenth time in a row to Arsenal...GGXX

Looks like I dangled ur ass, GGXX

GAY GOAL GGXX!!!!

Anderson...GGXX
by Mr. Henry March 04, 2008