Gears Of War Fanon:DMing

DMing is a shorthand term for "running/owning a roleplay".

About
See Gears of War Fanon:Beginner's Guide/DMing.

Term Origin
The term "DM" is an abbreviation for DungeonMaster, which is a person who runs a Dungeons & Dragons game. Since D&D games are roleplays, DMing is an appropriate shorthand for "running a roleplay".