When the accelerator is pushed so far it cant move any more- in some cars it hits a metal bar, or the end of the footwell (which is hopefully made of metal).
Hence the term pedal to the metal. Obviously if you have the accelerator all the way fowards youre gonna be gathering speed...or going fairly fast.
Crap! Cops, 6 o'clock, pedal to the metal Jerry!
A segment on American Shooter, a shooting TV show, about 'great guns' of the past. They feature guns like the M1 Garand, the Colt 1911, etc.
Dude they had the greasegun on great guns last night...now I want one so bad.