Ed "Big Daddy" Roth was an American artist, cartoonist, illustrator, pinstriper and custom car designer and builder who created the hot rod icon Rat Fink and other characters. Roth was a key figure in Southern California's Kustom Kulture and hot rod movement of the late 1950s and 1960s.

A custom car is a passenger vehicle that has been altered to either improve its performance, change its aesthetics, or a combination of both. Some automotive enthusiasts in the United States want to push "styling and performance a step beyond the showroom floor - to truly craft an automobile of one's own." A custom car in British according to Collins English Dictionary is built to the buyer's own specifications.