(countable, role-playing games) Initialism of game master or game moderator. / (countable) Initialism of general manager. / (usually uncountable) Initialism of genital mutilation.

Initialism of General Motors: an American multinational automotive manufacturing company headquartered in Detroit, Michigan.

(role-playing games) To act as a game master; to run a tabletop role-playing game.

Initialism of genetically modified.

(Internet slang, text messaging) Initialism of good morning.

Initialism of general manager. / Initialism of group message. / Initialism of game master.

(text messaging, Internet slang) Abbreviation of good morning.

plural of gm; grams.

plural of GM

Third-person singular simple present indicative form of GM