Maybe it's called something else, but to me a grilled cheese sandwich with extra stuff in it is an "ultimate". The extra stuff I'm referring to is generally tomato, onion (thin sliced raw or grilled) ...
So you go to a deli, pizza place, or any number of places that will sell you a 12"+ hot sandwich (e.g. a philly cheeseteak). You eat half and save the other half for another day. When that other day ...