This means that a person is "1337." Was origionally "1337 in the 511" but then the idiot who created it took off the last two numbers.
by John Thomson December 12, 2004
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1337 in da 5
• 1337
• 1337 sauce
• 1337 sp34k
• 1337 5P34K
• 1337 h4x0r
• 1337 sp33k
• 1337 $p3@k
• 1337 bacon
• 1337 Day