If you are a video gamer and routinely use the word "pwned" in that context, you are merely a dork.
If, however, you use "pwned" in a context such as:
David Gregory so totally pwned Scott McClellan at the press conference this morning!
you tend to portray yourself as an irredemable acne-riddled paste-eating mallowmar who deserves to be hung on a coat hook by your underwear daily, and whose every assertion up to and including "it's cloudy outside right now" should be given the utmost scrutiny for its veracity and insight.
That is all.