Flank Steak? Fail! The word "Fajita" loosely means belt. When speaking of food it describes the ONLY meat on an animal that can be considered Fajita is the diaphram muscle of a COW which here in Fajita country, i.e. Texas, is called a skirt steak. Calling anything other than the skirt steak of an animal large enough to have a skirt steak ( Shrimp and chickens are too small ) is like calling Tofu a burger. You can do it but it's just plain Wrong.