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When someone won't stop bugging you and making your life a living hell at the same time.
My mom naggravated me for an hour about my messy room. I finally screamed, 'I'm gonna die in this chaos!'
My brother naggravated me with his dumb jokes during the whole movie. I nearly threw the popcorn at him.
My boss naggravated me with ten emails about a tiny mistake. I wanted to quit on the spot.