Definition of pwning:
(v) :
(dated, Internet slang, online gaming, originally leetspeak, ambitransitive) To own, to defeat or dominate (someone or something, especially a game or someone playing a game).
(n) :
(Internet slang, originally leetspeak) Triumph, victory. Often exclaimed after an opponent in a video game is defeated.
(n) :
(Internet slang, computer security, originally leetspeak) An exploit in computer security, especially relating to machine code.
(n) :
Abbreviation of pulsar wind nebula. [Synonym of plerion]
(n) :
Abbreviation of person with narcolepsy.