(noun) Refers to the unmistakeable urge to to take an explosive shit after ones participation in a running related athletic activity, such as cross country or track. Usually amplified by consuming large amounts of food or water
After completing the marathon, Matt had a bad case of runners bowels and dashed to the nearest port a potty.
An addictive side affect from exhausting oneself in a footrace. Usually runners high varies differently depending on the person but it his been compared to an orgasim or being on drugs.