Noun
muchacho (plural muchachos)
(slang) An informal term of address, especially to a young man; similar to man, chap, dude, etc.
Hey there, my muchacho. How's it going?
"So you're talking about a thermonuclear explosion and adiós, muchachos." – Paul Reiser as Carter Burke in Aliens (1986)
“What it showed was that there’s a large vacuum,” Muchacho told the editorial boards of the Miami Herald and el Nuevo Herald. Source: Internet