The difference between Greaseball and Guido
When used as nouns, greaseball means a person of italian descent, whereas guido means italian-american male.
check bellow for the other definitions of Greaseball and Guido
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Greaseball as a noun (US, slang, pejorative, ethnic slur):
A person of Italian descent.
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Guido as a noun (slang, US, ethnic slur):
Italian-American male; an American male of Italian extraction as a member of the working-class.