When people get lots of thumbs down for their bullshit definitions of "pwned"
This word originated in Dota (warcraft III "mod")
because in the earliest version of this game, when you kill your enemy you need to take his head and sell it in a PAWN SHOP to get some gold. So it turns that, you have just "PAWNED" your enemy. Then the word "PAWNED" became "PWNED" for an easier typeing or maybe just to look more like another expression that means the same thing: "owned".
That's it. ^^
Girl 2: *thinking* You better back up bitch!
Girl 3: *up in Girl 2's face* OH! YOU JUST GOT PWNED!