Pwn Definition
verb
(Internet slang, online gaming, originally leet) To beat someone or something by a wide margin, usually in relation to a game.
Wiktionary
noun
(Internet, slang, originally leetspeak) Triumph, defeat, victory. Often exclaimed after an opponent in a video game is defeated.
Wiktionary
Origin of Pwn
-
own, possibly born out of a typographical error (o being adjacent to p on qwerty keyboards).
From Wiktionary