R297 This is the list that Wikipedia has put together.
Italians
Dago (U.S.) A person of Italian descent. Possibly originally from the common Spanish first name Diego.
Eyetie (U.S.) a person of Italian descent derived from the mispronunciation of “Italian” as “eye-talian”.[113][114]
Ginzo (U.S.) an Italian-American.[115]
Goombah An Italian male, especially an Italian thug or mafioso. From Italian compagno (companion).
Greaseball (U.S.) A person of Italian or Hispanic descent.[61]
Greaser (U.S.) A person of Italian or Hispanic descent. Also, members of the 1950s subculture which Italians were stereotyped to be a part of.
Guido (US) An Italian-American male. Usually offensive. Derives from the Italian given name, Guido. Used mostly in the Northeastern United States as a stereotype for working-class urban Italian-Americans.[116]
Guinea (U.S.) someone of Italian descent, most likely derived from "Guinea Negro", implying that Italians are dark or swarthy-skinned like the natives of Guinea.[117]
Polentone (Italy) A slur often used by southern Italians to refer to northern Italians. From polenta eater.[118]
Terrone (Italy) A slur often used by northern Italians to refer to southern Italians, especially Sicilians.
Wog (Aus) Australian slur for the first wave of Southern European immigrants and their descendants that contrasted with the dominant Anglo-Saxon/Anglo-Celtic colonial stock. Used mostly for Mediterraneans and Southern Europeans, including the Spanish, Italians, Greeks, Macedonians, Lebanese, Arabs, Croatians and Serbians.
Wop (U.S.) An ethnic term for anyone of Italian descent, derived from the Italian dialectism, "guappo", close to "dude, swaggerer" and other informal appellations, a greeting among male Neapolitans.[119][120] With Out Passport/Papers or Working On Pavement are popular inaccurate etymologies for the slur, supposedly derived from Italians that arrived to North America as immigrants without papers and worked in construction and blue collar work. These acronyms are dismissed as folk etymology or backronyms by etymologists.