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A maccometer is like a ruler for how much someone loves sticking their nose in other people's business. It's basically how much of a pain in the ass someone can be.
My neighbor's maccometer is through the roof. She knows my business before I do.
My mom's maccometer is like a 10 out of 10. She knows everything about my life.
My cousin's maccometer is so high it's almost a crime.