1 definition by Steve&Martia

Top Definition
A person who spends an un-healthy amount of time playing a beta (trial) version of a game, usually with the hopes it will make them cool/interesting.
Guy 1: Hey how's the Gears of War Beta?

Guy 2: Awesome! I'm already ranked 54 in the world for deathmatches!

Guy1: Fucking Masterbeta.

Person: You hear the Phantasy Star beta got shut down?

Other Person: I know! It's terrible! I would play that shit all the time with my friends! We kicked the D-Ragon's ass all the time!

Person: You guys are fucking Masterbeta's.
by Steve&Martia April 19, 2011

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