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An addict to the game RuneScape who owns one of the games most rare items, a party hat. In addition, phatmats are usually members that play from australia, frequently making comments about the kangaroo population.
Guy 1: Dude, you are such a phatmat.
Phatmat: No! I don't play, and I'm not an australian bloke!
by laspace January 14, 2010
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