Wiktionary
n. A drag racing car class. Generally, funny cars have forward-mounted engines and carbon fiber automotive bodies over the chassis that resemble manufacturers' showroom models.
Wikipedia
Funny Car is a type of drag racing vehicle and a specific racing class in organized drag racing. In the United States, the other professional drag racing classes are Top Fuel, Pro Modified, Pro Stock, and Pro Stock Bike. Funny cars are characterized by having tilt-up fiberglass or carbon fiber automotive bodies over a custom fabricated chassis, giving them an appearance vaguely approximating manufacturers' showroom models. They also have forward-mounted engines (engine placed in front of the driver), as opposed to dragsters which place the engine behind the driver.
Funny car bodies typically reflect the models of newly available cars in the time period that the funny car was built. For example, in the 1970s, then current models such as the Chevrolet Vega or Plymouth Barracuda were often represented as funny cars, and the bodies represented the Big Three of General Motors, Ford, and Chrysler. Currently, four manufacturers are represented in National Hot Rod Association (NHRA) Funny Car — Chevrolet with the Camaro, Dodge with the Charger, Ford with the Mustang, and Toyota with the Camry. Worldwide, however, many different body styles are used. These "fake" body shells are not just cosmetic; they serve an important aerodynamic purpose.