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A New Mexico Pace Car is the act of sitting with your buttocks above your head (preferably on a wall at a 45° angle) and pooping onto the front of yourself. The goal of the New Mexico Pace Car is to outrun your excrement before it slides into your mouth using your penis as a shift knob.
Co-Worker 1: "Hey man, what'd you do this weekend?"

Co-Worker 2: "Well, I figured since it was the anniversary of my divorce I'd celebrate by giving myself a New Mexico Pace Car and watching re-runs of M.A.S.H."
by MygrantGlassCo June 19, 2015
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