British slang for 100, especially the sum of 100 pounds (currency), a speed of 100 miles per hour, or a score of 100 in darts or cricket. The origin of this usage is not clear
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}