Piso definition is - the peso of the Philippines. Recent Examples on the Web. When the fish and potatoes are cooked, Belmira sets them aside and pours the broth over Óscar’s piso. — Cátia Bruno, Slate Magazine, "A Comfort Food From a Time of Hunger," 3 Oct. 2017 These example sentences are selected automatically from various online news sources to reflect current usage of the word 'piso.'