Like every country or region has its own accent and words also Argentina developed typical expressions. Argentina is a country full of immigrants or descendants of immigrants, mainly from Italy, Spain and other European countries. Every immigrant enriches the language with new phrases and words. You also must know that in Argentina and in South America nobody speaks “Español”…. They call it “Castellano”. Castellano just means the South American Spanish.
Here some common “argentinisms” (Argentinean words or expressions).