Dunjinmasta

(noun.) - a title given to or assumed by a person running a tabletop roleplaying game experience. This person is assumed to know most (if not all) of the rules, own the game books and must be committed to creating an immersive and interactive fantasy world. This person will also dispense imaginary beatdowns to your beloved characters and cackle with glee when rolling critical hits against them. See also: DM

"Ohh, holy crap! The Dunjinmasta rolled natural 20s on both of those attacks! Your tits got lit!"