Otherwise known as "Kurich". A Kurich/Couric is a unit of weight equal to 2.578 pounds, or 1.169 kilogram. This unit of weight is used by the European Fecal Standards And Measurements to measure the weight of feces. This term was made popular by South Park Episode 1009: More Crap.
Stan's dad takes what he believes is a record-breaking sized bowel movement, so he calls for an official weigh in by officials at the office of European Fecal Standards and Measurements in Zurich. The official unit of measurement is a Couric, named for the CBS news anchor, Katie Couric.