An informal unit of volume for beer and other alcoholic beverages, used mostly in Britain. A minipin is 1/2 of a polypin; this is about 17 Imperial pints or 10 liters (roughly 2.64 U.S. gallons)
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}