"A five-gallon (usu. metal) container for petrol, water, etc., of a type first used in Germany and later adopted by the Allied forces in the war of 1939–45."
"Originally: a pie of seasoned meat, esp. venison, enclosed in a pastry crust and baked without a dish (obs.). In later use: a small pastry case folded to enclose a (usually savoury) filling, similar to a turnover."