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A chess player of the highest caliber and greatest skill. Only the strongest of professional chess players, typically having a FIDE rating of 2600 and above. A vary prestigious and rare occurrence, only 400 or so living in the world. The United States Champion would be a Grandmaster.
The state champion at age 13, Daniel was touted as a possible future Grandmaster.

He beat everyone in the city with ease, but was demolished when he finally played a real Grandmaster.
by Schweinsberg July 26, 2004
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2
A MASTER DJ (Disc Jockey) One that is very skilled in the art of turntablism.
by DJ Scary G December 08, 2003
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A person of the upmost uberness, a banterholic of the greatest degree and leader of the grandmaster alliance.
In the beginning grandmaster created the banter and the alliance.
by Harold Shippman April 29, 2005
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4
To obtain 100 skill points in any given skill in the world of Ultima Online.
Bob managed to 7x Grand Master (GM) his newest character in less than a week. As he didn't leave his computer for days on end he had to poopsock numerous times.
by Dasspam November 08, 2009
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5
if you want to do that sort of thing ask the grandmaster first.
by mark October 12, 2003
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6
by Colly October 13, 2003
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7
by Anonymous October 15, 2003
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