Pirate's Swig is a term used to describe a drink made of RUM. It is a popular beverage among pirates and sailors, as it was often the only alcoholic drink available on long voyages. RUM is an alcoholic beverage made from sugarcane byproducts, such as molasses or sugarcane juice, and is usually aged in oak barrels. The term 'PIRATE's swig' is thought to have originated in the Caribbean during the 17th century.