A scooter commonly used by nacos and robbers to flee from the police after stealing your phone.
Usually they have an extremelly loud exhaust, neon lights, ugly stickers and no lights at all.

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.