Lyric discussion by Tucker 

Cover art for Dirt Bike lyrics by They Might Be Giants

This is yet another WWII song. The "dirt bike" is the Third Reich, and they've got plans for everyone. "Now I ride..." refers either to the ordinary people getting caught up in the mania of nazism, or to people being deported on trains (trains feature prominently as symbols of inescapable evil in TMBG songs).