"Rat Fink is one of the several hot-rod characters created by one of the originators of Kustom Kulture, Ed "Big Daddy" Roth. It is said[citation needed] that Roth created Rat Fink one day when trying to think of what Mickey Mouse's father might look like. He drew the original Rat Fink on a napkin, then transferred that image to his mother's refrigerator. After placing Rat Fink on an airbrished monster shirt, the character soon came to symbolize the entire hot-rod/Kustom Kulture scene of the 1950s and '60s. Rat Fink saw a revival in the late 1980s into the 1990s with the grunge/punk movements of the west coast, and continues his fame to this day with the growing neo-Kustom Kulture movement across the globe.
"The term fink was originally underworld slang for an informer, comparable to stool pigeon; ratfink is an intensified version of fink. By the time Roth used this name for a character, the term had started to pass into more general usage. It is also thought to have been a toned-down form of Ratf*cking, a slang term for playing dirty tricks.
"The name "Rat Fink" is sometimes used as a swear word."