In IBS, there may be increased mucus production by the lining of the intestine. That mucus is then passed in the stool. Mucus is more often associated with diarrhea-predominant IBS than with constipation-predominant IBS or alternating type IBS (IBS-A).
MUD. n. A computer program, usually running over the Internet, that allows multiple users to participate in virtual-reality role-playing games.
Many twists on the basic idea of a mud run have emerged in recent years. Some races cater to women only. Some races have adopted quirky themes: imagine zombies and superheroes. There are also very extreme events that have participants running through the obstacle course for 24 hours or more.