A foreigner, especially an American. "La Yuma" is the United States.
Descriptive rather than hostile — a yuma is simply a foreigner, usually a visitor. "Irse pa' la Yuma" means to emigrate to the US.
Widely credited to the 1957 western "3:10 to Yuma," which was popular in Cuba. Yuma came to mean America, and then Americans.
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