Here it's just the most common name for a formula mexican fast food place open 24/7/365 that sells big burritos, a lot of breakfast burritos, "platters" that come with rice and beans, and carne asada fries. Here I've seen them called Gual Berto's, Beto's and Rancherito's. Through the drive through you can get green sauce or red sauce but if you go inside most of them have a salsa bar with a few more choices.
All the caucasian people I know either get a breakfast burrito or carne asada fries.
Menu looks like this