A needy little bitch who doesn't wear the pants in the relationship. A person who acts like they are king shit till they get home to get railed by a strap on. A person who buys expensive Body building supplements but is build like a bird. A person who loses their turn with their spouse.

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.