Definitions include: acronym for "game master", characters, people, avatars etc. in video games or games in general who are usually in charge of the game, world, order etc., usually obtaining the highest ranking, status, position, control etc., and esp. played by employees or the game creator. Term is esp. used in MMORPGs and seen in all caps.
Definitions include: to be really bad-mood cause you can't get a cigarette to fulfill your need for nicotine, a nic-fit is a very serious situation when one doesn't want to interfere with the nic-fitter during the pursuit of a cigarette... or else someone might get hurt.