In Puerto Rico, if you go to a Taco Bell and order a Meximelt and they ask if you want to add queso derretido (melted cheese), and you say yes (thinking to yourself, "Isn't that kind of the definition of a Meximelt?"), what you actually get is nacho cheese sauce.

If you go to Flamers (an unfortunately-named hamburger place) and order a cheeseburger and they ask you whether you want American or Cheddar cheese, and you excitedly answer Cheddar (thinking to yourself, "Ooh, real cheese for once"), what you actually get is nacho cheese sauce.

Essentially, if we constructed a graph to describe the mapping of names to meanings in Puerto Rico, we'd end up with something like this:

I don't know why Puerto Ricans are so enthusiastic about nacho cheese, but I curse the name of whoever invented it. The one good thing it brought us (nachos proper) is far outweighed by the many ills (nacho cheese on a hamburger? Seriously?).