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A fancy way of telling someone you're about to lose your mind and they better shut up before you start screaming in the middle of the grocery store.
'I swear to god, if you talk about your cat one more time I'm gonna throw this loaf of bread at you.'
'I swear to god, I will go to the bathroom and come back with a mop.'
'I swear to god, I'm gonna start crying and then I'll start screaming.'