a pain in the proverbial
A person who acts like they're the only one who knows how to do things
My dad is a pain in the proverbial because he thinks he's the only one who knows how to fix the car
My teacher is a pain in the proverbial because she acts like she's the only one who knows math
My friend is a pain in the proverbial because she thinks she's the only one who knows how to cook
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