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Guido (/ˈɡwiːdoʊ/, Italian: [ˈɡwiːdo]) is a North American ethnic slur or slang term, often derogatory, for a working-class urban Italian American. The guido stereotype is multi-faceted. Originally, the term was used as a demeaning term for Italian Americans in general. More recently, it has come to refer to Italian Americans who conduct themselves in an overtly macho manner or belong to a particular working-class Italian-American subculture.  The time period in which it obtained the later meaning is not clear, but some sources date it to the 1970s or 1980s. The term is not currently used in Italy.
The word "guido" is derived from the Italian proper name "Guido", which is loosely the Italian version of Guy. Fishermen of Italian descent were once often called "Guidos" in medieval times.
The term is used in states and metropolitan areas associated with large Italian-American populations, such as New York City, Buffalo, Detroit, Ohio, Connecticut, Pittsburgh, Philadelphia, Boston, Providence, and New Jersey. In other areas, terms such as "Cugine" (Brooklyn), "Mario" (Chicago) and "Gino" (Toronto) have a meaning similar to guido. Although some Italians self-identify as "guidos", the term is often considered derogatory or an ethnic slur. ...
Guido is a given name Latinised from the Old High German name Wido that originated in Medieval Italy. Guido later became a male first name in Austria, Germany, the Low Countries, Spain, Portugal and Switzerland. The meaning of the name is debated with various sources indicating the Germanic "Wido" means "wood" and others connecting the Italian form "Guido" to the latinate root for "guide".
The name "Guido" has developed as a term used in American culture as a stereotype and ethnic slur for working-class urban Italian Americans. ...