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A person you don't know but you love like your own. Basically your new family member, even if they're a pain in the ass.
My D. o. m. h. just texted me a photo of her cat wearing a hat. I'm gonna marry that cat.
I called my D. o. m. h. a f***ing disaster. She texted back 'Thanks, I love you too.'
My D. o. m. h. is the only person who can make me laugh when I'm crying because my ex broke up with me.