It means either overpowered or original post depending on how it's used.
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Lol, n00b, has 2 meanings depending on context, in a forum OP can refer to the 'Original Poster', usually used to get a thread back on topic by going pack to the first post and talking about it again. The other meaning, seen more often here is 'Over Powered'. Meaning they think a particular character is too strong for whatever reason.
Kind-of Anticipating: God of War: Ascension, Metal Gear Rising: Revengeance, Aliens: Colonial Marines