pr0n// [Usenet, IRC] Pornography. Originally this referred only to Internet porn but since then it has expanded to refer to just about anything. The term comes from the warez kiddies tendency to replace letters with numbers. At some point on IRC someone mistyped, swapped the middle two letters, and the name stuck, then propagated over into mainstream hacker usage. Compare filk, grilf, hing and newsfroup.