The word is used as a shorter way of calling someone an arrogant retard . Someone with this name is usually a fuckwit of the highest degree and should be avoided at all costs

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.

a sexy ass man with big lips and chopstick fingers