DMAA

DMAA, D.M.A.A., n., acronym Dungeon Master's An Asshole; used to refer to referees (specifically, D&D DMs) who abuse their power. [BB]
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Addendum: corruption of DMO. Used to refer to events in a game that have no particular logic or explanation except the DM's whim, when said events really dick over the players. Most recently, this involved an inexperienced DM who gave the party too many neat toys. Upon realizing his error, he took the toys away with the explanation "DMO." [BB]