When you're very bored and also talking on discord to your friends, and you managed to find this word and nobody has defined it yet. Congrats, many others said you were the king of boredom, you've been promoted to god of boredom.

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.