From the context in which I read "OP" in comments and answers, I understand that it refers to the person who asked the question, but I can't find any reference to the meaning of those letters, nor can imagine it.

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    Original Poster (no need to delete this I think it's a great question) – percusse Dec 4 '12 at 16:47
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    Urban Dictionary is often a good place for finding the meaning of such abbreviations. – Torbjørn T. Dec 4 '12 at 17:27
  • Kept me thinking for a while too, when I first saw it. – Count Zero Dec 4 '12 at 18:05
  • I use Acronym Finder which tends to lists most of the definitions associated with an abbreviation. – mythealias Dec 5 '12 at 15:39

It means 'Original Poster', and is pretty common in for example Usenet (where you have a thread starting potentially with an anonymous question).

For a complete list of Stack Exchange terms, see Stack Exchange Glossary - Dictionary of Commonly-Used Terms.

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  • Thanks for the glossary link too! – JLDiaz Dec 5 '12 at 10:18

In addition to "original poster," it is also sometimes used to mean "original post," with the assumption that you can tell which is meant based on the context.

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