Hot Dog

Hot dog \hot.dawg\ , noun;

Despite being an Illinoisan, I like mustard-only hot dogs.

Hot dog as "sausage on a split roll" goes back to the 1890's as college slang and supposedly reflects a 19th century (sometimes true) suspicion that sausages contain dog meat. The slang meaning of "someone particularly skilled or excellent" dates to 1896 and may or may not be related to the food item. Hot dog! as an exclamation of approval had appeared by 1906.