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1.
igm
ingame messaging.

Network-based communication being transmitted over a game related network.

I prefer igm chat over forums.
by gejr January 16, 2008
 
2.
Ingame memorial service. A virtual funeral often seen in popular MMO's such as World of Warcraft.
Dude, that conservative chick died.
I know! They are holding a IGMS for her now.
by pawnster May 27, 2010