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A grumpy old nag who yells at you like you owe them money. Bob called Linda Belcher Nagatha Christie because she was being a pain in the ass.
Bob: 'You're louder than a jackhammer, Linda!' Linda: 'I am not!' Bob: 'You're Nagatha Christie.'
At the dinner table, Linda kept complaining about the meat. Bob said, 'You're Nagatha Christie again.'
Linda started yelling about the TV show. Bob said, 'If you don't shut up, I'll call you Nagatha Christie.'