Originally a Mexican word used to insult low-class people it's slowly becoming part of the American vernacular because they don't have a word as all-encompassing. It's used as a general insult for someone who you think is less sophisticated than you, regardless of wealth.
Maria-Lupe is such a naca. She only eats lobster when she goes out on a date because she thinks it makes her look classy.
Classless, pretentious, obtrusive, the Mexican version of white trash. Mostly blue-collar undereducated people, but can be applied even to a wealthier crowd (nouveaux riches, snob). They’re characterized for having no respect for others. Their only source of information is television. Males usually are truly soccer fans and females are telenovelas (soaps) fans. Most nacos like to name their sons with anglo-saxon names. It may be used as an adjective for both persons and objects.
“Kevin thinks that neon lights on his car will make it faster, it looks so naco.”
Word is commonly used among Mexicans.
"Don't be a naco dude, please don't put bull horns and a horse saddle on your 1981 beat up low rider truck"
Vocabulary that is considered naco includes:
"Chale" - used to express dismay
"carnal" - most commonly to refer to a brother, but may refer to a friend, depending on the setting.
cámara - literally means "camera". It is used as a synonym of "OK".
"verga" - "penis" when used as a noun, may also be used as an interjection to express worry.
"chingón" and its politer equivalent "chido" - equivalent to the aesthetic "cool"
"nave" - literally "ship", used to refer to a car.
"wey" - fella', buddy.
Naco: "Puta madre, tengo un chingo de hambre wey, dame unos tacos por favor."
The self-identifying "naco" rejects all idealized versions and expectations imposed on him or her by Mexican society and finds comfort, wisdom and guidance in life from the long standing strains of resistance to assimilation and acculturation that his or her forebears engaged in since the 16th century.
I'm keepin it real naco, fuck all this fresa, malinchista bullshit, y que viva Mexico cabrones...