in reference to the really bad definitions of shirley that are on here, not that kinda shirley is awesome, almost angelic and applies to all the shirleys that are actually not white trailer trash sluts with daddy issues who want to steal your cancer meds to sell.

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.