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An Opinion Definition is usually a definition of something, say a band, about peoples opinions about it. While they "sort of" define the band, they mostly talk about how great they are, or how bad they are. Urbandictionary is full of these.
Good Opinion Definition: Kottonmouth Kings are a Rapcore/Punk band located in Southern California. They're the greatest band EVER!!!

Bad Opinion Definition: Kottonmouth Kings are a dumbass wigger rap group from Southern California. Buncha fags.
by K-Yo March 03, 2007
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