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1.
Posting a definition of a person, place, or thing on Urban Dictionary that you don't like just out of spite. If done about a person, its usually by a balls-less person who is afraid to say it to said person's face.
Chad: Dude, I'm gonna do some Urban Dicktionarying about John later because I am too much of a pussy to talk shit about him to his face.

Dakota: Only total Thunder Cunts do that... You dumbass.
by Dakota ftw February 20, 2010