1337 "leet"
Hacker "Sp33k" for leet, or elite. Originating from 31337 "eleet", the UDP port used by DeadCowCult, a HackerGroup, to access WinDows 95 using BackOrifice, a notorious hacking program.
http://jargon.watson-net.com/section.asp?f=hacker-speech-style.html
http://www.faqs.org/rfcs/rfc1337.html
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How to become l33t v1.0.7, by gentoo users on efnet and other leet gods, compiled by xiando
How to become a l33t person, a status that will bring you friends, glory, money and most importantly the funding to buy lots and lots of boxen and give you access to what you want whenever you want