#op- is a prefix indicating that the word it is attached to is the target of a hacktivist attack by an individual or group under the mantle of "Anonymous." The word it is attached to could also be the entity avenged by the hacker attacks.
Anonymous A: "Now Ireland's talking about legalizing web censorship?"
Anonymous B: "That's why #Op- Ireland (#OpIreland) is in full force. We've already hacked some of their government websites.
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Anonymous C: "Why can't I get my files from MegaUpload anymore?"
Anonymous D: "Dude, have you had your head in the cloud. Don't you know the feds took down the site?"
Anonymous C: "Man,*&%$ that! #OpMegaUpload! See how the feds like their own medicine.
by Ghaliji January 26, 2012

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