Runners bowels

(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.

Runners bowels by Joshie G. April 23, 2010

Runner's Bowel Syndrome 

When a person runs faster or longer than they're accustomed to, they might have sharp, sudden urges to defecate. The defecation is usually diarrheal, and the runner feels greatly relieved afterwards.

(2 Men are running in the woods.)

Man #1 - I can't believe we've ran for 10 miles!

Man #2 - Neither can I. But can we stop soon? I think I might be catching Runner's Bowel Syndrome.

Runner's Bowel Syndrome by run4life2011 October 10, 2011