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E1337st is when you act like you're the only smart one in the room and laugh at everyone else's dumb mistakes.
I asked what 1337 meant and he said, 'You're not even close. Go back to your dumb phone.'
She texted me, 'Lol, you're like a 1337st.'
He said, 'You're not 1337st. You're just a basic human being.'