In other words. A fat bitch who works at Oxford Middle School known as Ms. Erker. She is a stonefish because she does stonefish sex.

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 person who is constantly stoned, by marijuana and drinks like a fish,alcohol.