What is the origin of the idiom "pedal to the metal" and when to use it?

The idiom "pedal to the metal" originated from the world of driving and automotive racing, specifically referring to the act of pushing the accelerator pedal all the way to the floorboard. This action maximizes the engine's power and acceleration, allowing the vehicle to move at its fastest speed. This phrase is now used to convey the idea of pushing the vehicle one is driving to its absolute limit.