pr0n

from Jargon File (4.4.4, 14 Aug 2003)
pr0n
 //

   [Usenet, IRC] Pornography. Originally this referred only to Internet
   porn but since then it has expanded to refer to just about any kind.
   The term comes from the {warez kiddies} tendency to replace letters
   with numbers. At some point on IRC someone mistyped, swapping the
   middle two characters, and the name stuck. It then propagated over
   into mainstream hacker usage. New versions of the Mozilla web browser
   internally refer to the image library as "libpr0n". Compare {filk},
   {grilf}, {hing} and {newsfroup}.
    
from The Free On-line Dictionary of Computing (8 July 2008)
pron
pr0n

   <jargon> (Or "pr0n") {B1FF}-speak for pornography.  Often seen
   on {IRC} in such desperate cries for help as "I WNAT
   PRON!!!!!"

   (1997-09-14)
    

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