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1.
mm2
A Saying in Counter-Strike meaning literally "messagemode2" or "team talk only"
Dudes, MM2 only please
dodane przez Jessen lipiec 15, 2003
 
2.
mm2
mm2 can be used outside of gaming. It would be replacement to the commonly used and much loved acronym, STFU.

Only this time you are telling someone to mm2, and they're the only person on their team.
Listen to some idiot talking and then say, "mm2"
dodane przez shoesy marzec 15, 2005