A social experiment that has gone terribly wrong which consists of Sean Hannity expelling excrement directly into the mouth of Donald Trump, whose mouth has been sewn to the anus of Sean Hannity, and then Trump expelling excrement directly into the mouth of his base, whose mouths have been sewn to his anus.

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.