naco adj. common, ordinary, plebeian, unfashionable, vulgar. (source: Double-Tongued Dictionary)
Further reading
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Language is always evolving, and that’s also true for American Sign Language. A century ago, the sign for “telephone” was one fist below your mouth and the other at your ear, as if you’re holding an old-fashioned candlestick...
In Mexico, a very derogatory / racist reference to a poor person (invariably of Indian appearance).
it can also be used for fun, not only to offend
usu used like ‘que naco’ or ‘que naca’ for a girl.