The Mach 5 is Speed Racer's car, and it's very fast. In this song, Presidents Of The United States Of America frontman Chris Ballew recalls his childhood when he used his imagination to drive his own Mach 5.
"That was about the joy of when I was a little kid," he told Songfacts
. "I loved building model airplanes or buying Matchbox cars and playing with them for a while, but then devising maniacal ways to destroy them. That was part of the fun. You know, loading up a B-52 model bomber with gunpowder from a brick of fireworks and lighting it on fire. So it was just about the joy of smashing."