What is A fajita?

a generic term used in Tex-Mex cuisine, referring to grilled meat served on a flour or corn tortilla. Though originally only skirt steak

In Spanish "faja" means belt or girdle; "fajita" is the diminutive form. In original Tex-Mex culinary parlance, fajitas are a dish with roots in the Rio Grande Valley of Texas made from a specific cut of meat: skirt steak. Considering the appearance of the meat – a strip about 18 inches long and about one inch thick – and its placement in the beef carcass beneath the heart and lungs, fajita (little belt) is a particularly apt nickname. There are only four skirts per beef carcass, yielding about 8 lbs. of meat. The two outside skirts are the diaphragm muscle from the forequarter and the two inside skirts are the secondary flank muscle from the hindquarter.