yeah, it's sorta popular among online gamers. Like I think it originated with guys playing counter strike. Guy killed somebody and typed "pwned" really fast instead of "owned".
actually pwned orginated from warcraft 2 in which when you lost to the computer, a designer spelled owned wrong as pwned, and it says pwned before you died.
i was playing wolfenstein enemy territory the other day, and the last 4 numbers of my player # (you get a new one each time u connect to a server) were 1337. and then i pwn3d some n00bs.