potty soup
A condition that occurs when many people use the same toilet but do not flush, thus creating a yellow/brown soupy broth in the bowl. This condition is most commonly found in public restrooms on interstate highways, in shopping mall restrooms and bathrooms in college dormitories.
I shouldn't have eaten lunch at Taco Bell because when I went to use the restroom at the mall I was confronted with potty soup in every stall!!!