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1.
Stands for Command Center Good Game. During the 2010 Starleague live commentary on SC2GG was used as a joke to land the Terran command center on the opponents drones killing them and winning the game.

Created off the game Starcraft.
The live chat was filled with CCGG's after Flash won vs Jaedong
by Lonosphere January 23, 2010
 
2.
crushing your opponent's units with a command center.
doing a cc rush (a 14 CC) in the game of Starcraft.
I just proxy'd a cc on my opponent's probes. he went TT cc gg.
by dobbersp January 23, 2010