1. An ancient puebloan culture centered in what is now the Four Corners region of the American Southwest.
2. A brand of outdoor footwear, best known for their river sandals. Some people would say Chacos are how you tell a real outdoors person from a poseur who may be wearing some other type of sandal. Chacos are generally available only from specialty paddling and outdoor specialty shops such as The Trailhead in Buena Vista, Colorado.
Seth - "That dude must be a real river guide."
Clay - "How can you tell?"
Seth - "He's wearing Chacos."
slang for vagina, evoking both chaunch and meat taco
Jennifer Lopez has a well oiled chaco.