"1337" is 'leet talk' for leet; 1=L 3=E 7=T
Short for elite, also known as, really frakin dumb.
Now, agg, thats another thing, i have been told it is short for 'aggressive' and horrible misconstrued to mean 'cool' by pre-purbescent nerds and dip-wads.
Oops, didnt realize 8 other people posted before me...
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