A person called a “Fionka” is a usually very aggressive person towards strangers. When a person associated with the nickname “fionka “, they will try to have a scrap with people they dislike, however most of the time they get stabbed in the back.

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.