The term 1337 H4x0r (
1337 sp33k for
Elite Hacker), is
generally used to describe a PC gamer who is very good with using hacks (H4x) to obtain an unfair advantage. The term is most often an oxymoron because a player who uses cheats is generally not a good (5K1ll3d) player. In other words, this is an oxymoron because someone who is a hacker cannot be 1337.
A rare exception is this: in Halo for PC there was no way to enforce cheating, and in large clan war websites (like the old www.klanwars.com) many clans used hacks to stay on top. Thus, in very high ranking clan games, every player would be using hacks (ie:aimbots and wallhacks). Thus, the best H4x0rs could be considered 1337 compared to other hackers... a 1337 H4x0r.