A high and low measurement of the thickness/solidness of one's feces. High Fecal Viscosity means constipation. Low Fecal Viscosity means loose, watery stool.
Roger was urinating in the men's room when he heard the man in the handicap stall suffering from low fecal viscosity. He was taking a mop bucket dump.
Vaginal Viscosity is a measurement used to describe the thickness and texture of a substance secreted or residing in the vaginal tract of the female counterpart to the male part of the human race. It can be checked by tongue, finger, teeth, a form of sunflower, or otherwise. Some emanating juice may taste good. Other not so good. Feel free to try it out.
Guy 1: "Dude, this chicks vaginal viscosity was like a McDonaldsmilkshake."
Guy 2: "Really? Wow the last girl I had was as runny as a babies nose in winter"