The term 'American Graffiti Car' refers to a classic hot rod, which is a type of vehicle that has been modified for speed and performance. Hot rods are typically American-made cars from the 1930s to the 1960s, such as Ford Model Ts, that have been customized with larger engines, improved suspension, and other modifications. The term 'American Graffiti Car' is often used to refer to the iconic hot rods featured in the 1973 movie American Graffiti.