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The master of any game. Creates all rules and stipulations of the game. Can decide the outcome and winner of the game if he so desires.
As the Gamemaster I declare you the winner and new champion of the game.
by WANTAAN December 29, 2016
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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"Game master," "gamemaster," or simply "GM" is a title for the officials in an online RPG (role-playing game) which refers to those in power in a game whom do any of the following: devise rules and regulations for the game and design how the gameplay will be (developer), enforce those rules and regulations (moderator), or had a hand in developing the game's scripts itself (coder).

Not to be confused with "Master Gamer," who is simply a player who has mastered the game (a person that is extremely good at the game that has had no hand in the workings of the game).
"Be careful using your hacks right now dude, there's a Game Master in the lobby! Don't want to get banned."

"Damn GM, I was having a good time wrecking these noobs with Huzuni."
by Doxierox June 27, 2014
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