Applepie420 is a disgusting picture of an apple pie lol jk it’s not a thing but apple pie 420 、 djdっbdかというからこの世の果てで恋を唄う少女YU-NOに、矢でおると思いますにおるのおれはありがとう

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.