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A n00bxorz is a dumbass who thinks he's cool because he spends all day on stupid online games and message boards. He talks like a moron and makes everyone laugh when he messes up his words.
'Bro, I'm in the matrix, bro.', he said that like it meant something.
'I'm the king of the nerds!', said the guy who lost a battle to a 10-year-old.
He tried to say 'n00bxorz' and ended up saying 'noobxorz', and no one got it.