Hotdog+bun+chili on top=chili dog. Add cheese, onions, relish, or salsa if you like. The chilidog that inspired this particular thread was named George, and he was on a poppyseed bun with cheese and chili. He was delicious.
Boboss, its the transition of the hotdog into a jacket potato. Its a hotdog+toppings rather than potato+toppings. Because all North American dishes must begin with a base of processed meat.
I generally just use the chili as a garnish and sauce. Onions might be nice, but a nice meaty chili that already has lots of veggies in it as well (such as the kind my family makes) really doesn't require any additional toppings.