put the pedal to the metal

Put the pedal to the metal in regards to driving means to press a cars accelerator to the floor in order to drive very fast, but this can also be used as a more figurative phrase. While it is most commonly used as a driving or vehicle idiom in a more literal sense, it can also be used figuratively as in to say you should hurry up or speed up what you are currently doing by putting all of your speed into it.