WotC has trademarked the term “Dungeon Master,” which is why other games call the person in the same role “Game Master” or “Keeper” or “Master of Ceremonies,” but they can’t really put a blanket trademark on all uses of the abbreviation, so i propose we all agree that “DM” stands for “dumbass monitor”
Which leaves the question of whether it’s a person who monitors dumbasses, or a monitor who is a dumbass. And, well, both interpretations are equally valid.
you get it
if it’s anything like the games i’ve played, then it definitely means both versions at the same time