A leet way to say master or pro in video games.
The word most probably originate from the video game comedy series purepwnage (www.purepwnage.com). In that serie, the Masterer is the master of all the pro players in the meeting happening in the 15th episode.
Mock them, own them, but do not hate them. For without noob, we would not be leets. - The Masterer
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