The 4-C is slang for the Four Corners. Which is the region of the U.S. including Southeast Utah, Southwest Colorado, Northwest New Mexico, and Northeast Arizona. It derives its name from the Four Corners Monument, which is the only place in the U.S. where four states come together at one point. Locals from the Four Corners Area, which includes all four involving states, refer to their home region as the "4-C".
I'm from farmington, NM. You know... the 4-C
I can't wait to get home to the 4-C, I miss Durango.