Grogs meaning : (original meaning) An alcoholic beverage made with rum and water, especially that once issued to sailors of the Royal Navy. (by extension) Any alcoholic beverage. A glass or serving of an alcoholic beverage. An alcoholic beverage made with hot water or tea, sugar and rum, sometimes also with lemon or lime juice and spices, particularly cinnamon. A type of pre-fired clay that has been ground and screened to a specific particle size.