A term used in BDSM for a singular male or female who rules over a group of at least three other individuals at the same time. The persons role is similar to that of a dominatrix but with multiple subjects or "Dungeonee's"
"Hey man, you wanna hang out tonight?"
"No way, if i skip out on my dungeon master again she'll pour wax into my ass."
"Did you catch the game last night?"
"nah bro-man, i was to busy being a dungeon master"