Pre Exercise Poop. Emptying ones bowels in order to prevent possible accidents and lighten the load on ones body. Typically done by long distance runners before their workout.
Runner #1 "Only half a mile left. I really gotta shit"
Runner #2 "Dude, why didn't you take a P.E.P?"
Runner #2 "Dude, why didn't you take a P.E.P?"
by LongDistanceDude January 06, 2014