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A human-shaped meatball of a person who thinks they're the center of the universe and everyone else is just there to suffer.
My cousin is an obnox. He texts me at 2 a. m. with a selfie and a question about why I don't like him.
The obnox at the party brought a pet goat and tried to make it talk.
My teacher called me an obnox because I said 'you're wrong' five times in a row.