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A total noob who thinks they're cool just because they spelled 'leet' with numbers. Also check out nub, which is basically the same thing but worse.
DM: 'I’m l336 bro, you’re just a nub.'
Tweet: 'L336 is the worst, I can’t even spell leet properly.'
Text: 'Why are you laughing at me? I’m l336, not some dumb nub.'