She’s a beautiful southern belle and has brown hair with cutest smile, she can sometimes be shy but when she gets to know you she’s the most fun person ever, she’s good at math, and is sooooo pretty

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.