The first time I ever tried something similar was in Minnesota of all places and it was called a walking taco. They took a snack sized bag of Doritos cut one end open and filled it with seasoned taco meat (ground beef I hope), cheese, shredded lettuce, diced tomatoes and a bit of sour cream. Fantastic.
The Frito Pie was a bit heavier; over a pound of food product to be exact. There are the snack sized bags of Fritos, pre-cut open and stacked high on the counter next to a bubbling vat of chili. There ae a lot of recipes for chili but from what I could tell this one had no meat, just beans. It was thick and hearty and they added a ton of cheese on top. I am not sure if there was anything else in there I could not tell (which can be a good sign or a bad one).
I like that the bag is your plate, less waste and easier to transport. You get a spork and dig in. It was flavorful and good but it is too damn much. I could not finish it. Some roughage would have been nice, like some onion or tomato. If you are going to try this it may be best to share one.