guy 1: did you see vanishing point last night?  guy 2: yeah, kowalski really put his balls to the metal and left those cops in the dust
this phrase is a combination of [balls to the wall] and [pedal to the metal]
"guy 1: did you see vanishing point last night?  guy 2: yeah, kowalski really put his balls to the metal and left those cops in the dust" What is the definition of "balls to the metal"?