Funny Cars with flip-top bodies are commonly nicknamed floppers.
A flopper is a drag-racing car whose lightweight body is hinged so it can tilt or “flip” open for access to the engine and chassis. The nickname became associated especially with Funny Cars, which use a full-bodied silhouette over a purpose-built tube-frame chassis rather than the exposed frame of a traditional dragster.
The term emerged in the late 1960s as dragster crews needed a quick way to distinguish Funny Cars, with fiberglass bodies and fenders, from open-wheel dragsters. Funny Cars typically retain a recognizable production-car shape, but their bodies are highly modified and sit over powerful racing hardware.
Flopper is not synonymous with every drag-racing nickname. A rail or digger generally refers to an exposed-frame dragster, while a gasser is a distinct style of altered production-based car. Modern Funny Cars use carbon-fiber or composite bodies, but the flip-up design and the old nickname remain part of drag-racing vocabulary.