To go as fast as possible or work at maximum intensity, holding nothing back in pursuit of a goal.
This automotive phrase emerged in the mid-20th century, referring to pressing the gas pedal all the way down until it touches the metal floor of the car. The expression captures the mechanical limit of acceleration available in a vehicle.
Interestingly, this phrase gained popularity during the muscle car era of the 1960s and 70s, when cars actually had enough power to make 'flooring it' dramatically noticeable. Modern cars with electronic throttle controls have somewhat diminished the tactile experience the phrase describes.
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