what is a gm?
Chess: Grandmaster, the highest mastery level one can reach (maybe apart from being the World Champion). Once achieved, the title is held for life. A player must have attained an Elo rating of at least 2500 and at least two favorable results (called norms) from a total of at least 27 games in tournaments involving other Grandmasters.
Online games (mainly MMORPGs): Game Master, usually a moderator or administrator which navigates through the online world and possesses powers that usual players don't, such as teleporting via dimensional coordinates set up, instant mob/items spawn/kill, sometimes banning/kicking members for abuse or cheating suspicion, etc.
Automobilism: General Motors, American multinacional corporation headquartered in Detroit, Michigan, that designs, manufactures, markets and distributes vehicles and vehicle parts, and sells financial services.
Colloquial uses: May be used as abbreviation to "Good Morning", "Genetically Modified" or "Good Move", according to InternetSlang.com.
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