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Anonymous
OP means Original Poster( don't get me on semantics if it's some other slight variation, the idea's the same). "I'm OP" == I'm the original poster.
It's usually only useful when you wanted to be anonymous, but then decided later that you needed to respond to someone with the credibility of the original poster.
And as of this posting, /r/ is currently down, so directing someone to it is pretty much indicative of retardation...
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