The brown (and sometimes other colors such as green, black, etc.) watery goo that is violently ejected from your anus during those long painful sessions of explosive diarrhea. Known causes: beer (in large enough quantities), Mexican food (in any quantity), stomach viruses (contracted from dirty bathrooms, Mexican food places, etc.), and from having sex with ugly women (or so I've heard).

When you eat dirt for the first time and leave your family to build a shack in the woods