Gringo is a borrowing from Spanish and is alteration of Griego, or Greek. In Spanish, the phrase hablar en griego, to talk in Greek, means to speak unintelligibly. This is akin the the English phrase, it’s Greek to me. Both apparently come from the Medieval Latin proverb, graecum est; non potest legi, it is Greek; it cannot be read.
P. Estaban de Terreros y Pando’s 1787 Diccionario Castellano contains the following:
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Gringos, Ilaman en Malaga a los estranjeros, que tienen cierta especie de acento, que los priva de una locución fácil y natural Castellana; y en Madrid dan el mismo, y por la misma causa con partiuclaridad a los Irlandeses.
(Gringos, they call in Malaga those foreigners who have a certain type of accent which keeps them from speaking Castilian easily and naturally; and in Madrid they are given the same name, and for the same reason, particularly to the Irish.)
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