A word from a "language" (used loosely)created by a bunch of internet junkies who are either too lazy to type out, or too uneducated to know how to spell actual words from the English Dictionary.

pwnd comes from pwnage what then comes from pure ownage. it's used to described a total beating.

being throughly and utterly defeat, anihallated and/or destoryed, stemming from a misspelling of the word owned. common amonst online gamers upon winning a match

Al Gore "invented" the phrase to best describe his defeat in the 2000 presidential election.

To be owned by another player.
Started with Warcraft or Quake
NOT WoW.

Actually not a typo or misspelling,
at the time vowels were not a part of many game designs
that is also why it is not spelled pwnEd.
"p" looked the closest to "o" in the game so that's the reason for the switch. not a typo, or leet speak, or any reason you kids could possibly think of. Just simple improvisation.

Means to be shown up in gaming abilities

A moronic variation of "owned" (see "owned", which is equally moronic). Don't bother using it. Only losers and morons use it.

Summarily beaten, defeated..

ownd with a p