[simaˈron]), is a traditional South American caffeine-rich infused drink, particularly in Argentina (where it is defined by law as the national infusion), Uruguay, Paraguay, the Bolivian Chaco and Southern Brazil, and in southern Chile.s the Yerba Mate Association of the Americas points out, with the accent the word mate maté In spanish Means i. Killed In, brazil traditionally prepared mate is known as, chimarrao chimarrão although the word mate and  the expression  (mate amargo) bitter mate are also Used in Argentina. and uruguay