An offbrand version of the “ok boomer” term. It’s used to make fun and bully your friends or random people on the streets. It is a very insulting term and should be used to inflict as much damage as possible.

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.