What is a punch buggy?

A punch buggy, also known as a slug bug, is a slang term for a Volkswagen Beetle. The game associated with spotting a punch buggy involves punching someone lightly on the arm whenever one is spotted on the road. This game is typically played by children and teenagers during car rides to pass the time. The popularity of punch buggies has waxed and waned over the years, but they remain a recognizable and iconic car model.