Rank Abbr.Meaning MM2Murder Mystery 2 (Roblox game) MM2Monster Manual II (roleplaying games, Dungeons and Dragons) MM2Midtown Madness 2 (game) MM2MegaMan 2 MM2Message Mode 2 (gaming) MM2Mixtape Messiah 2 (Chamillionaire album) MM2Machinists Mate Second Class (naval rating) ...