n. a friend. (Spanish. Also a term of address.) : Hey, amigo, let's go somewhere for a drink.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
amigo
"friend, comrade," often a form of address, 1837, Amer.Eng. (first attested in the phrase adios, Amigo), from Sp., lit. "friend," from L. amicus.
[uh-mee-goh, ah-mee-; Sp. ah-mee-gaw] 
