Man, I feel poor now. 
When I was a kid, here are some definitions of foods that I later realized weren’t standard
French Toast Pizza = discount-bakery bread rolls topped with ketchup and sliced vienna sausages and if we’re lucky, a few dent-can mushrooms, tossed into the oven and then covered with half-a slice each of off-brand American “cheese product.”
Breakfast for Dinner = lots of pancakes and margarine. No syrup, too expensive.
Tuna Casserole = offbrand mac & cheese, dent-can tuna, and bread crumbs from the bottom of the toaster. Hard-boiled egg slices if it was a good month.
Taco Casserole = thick layer of potatoes, really thin layer of hamburger-bread-egg (mostly bread and egg) covered liberally with spices and whatever dent-can veggies were on hand. Cover with ‘cheese product’
BLT was a whitebread sandwich (bread usually toasted because it had been frozen) with iceberg lettuce, tomato paste, and bacon bits like normal people use for salads.
To cool us kids off during the summer (lowcountry South Carolina here) mom would send us outside with frozen hotdogs on sticks to munch on and keep us cool. My husband didn’t believe me for a long time. I still like cold salty uncooked hotdogs… 
Potted meat was a luxury - a step up from fried bologna, and almost as special as SPAM, one of which usually ended up being the meat for Sunday dinner. Getting a sandwich with potted meat in it (usually devilled ham - I think it got dented a lot) was a special treat. Likewise having actual hard-boiled eggs or devilled eggs as an individual food, rather than bulking out something else.
Sardine cracker sandwiches (two crackers, lots of mustard, half a canned sardine) were likewise great treats. One packet of sardines had about 6 fish, and so that was 12 sandwiches - 4 for each kid!
I remember lots of tomato soup. I remember powdered milk going in everything cookable so that we could use the “real milk” for dad’s breakfast and our cereal - a big treat on sunday morning was half a glass of chocolate milk made with chocolate syrup and real milk. If we wanted chocolate milk otherwise, it was off-brand powdered chocolate mix and powdered milk.
Lots of beans, lots of rice. Lots of veggies, usually canned, sometimes expired. Lots of leftovers (made on purpose, of course) Lots of meals with no meat. Lots of meats that I really don’t want to think about the actual contents.
I remember one Sunday getting “real” blue box mac&cheese, and getting to put fried hot-dog wheels in it, and being ecstatic about how good it was compared to normal.
When I got to college, cheapo ramen packages actually made two meals each - lunch was the noodles in just hot water, and dinner was the powder packet mixed into a mug of hot water for “soup.”
I find that the only lasting effect of this upbringing is that I really dislike using canned vegetables in my food, and that I absolutely refuse to eat leftovers.