What is the origin of the word hot dog?

A hot dog or frankfurter, or wiener is a moist sausage of soft, even texture and flavor, often made from meat slurry, typically beef and pork, though some recent varieties substitute chicken or turkey. Most types are fully cooked, cured or smoked. Hot dogs are most often served hot in hot dog buns, which are special soft, sliced rolls. They may be garnished with mustard, ketchup, onion, mayonnaise, relish, cheese, bacon, chili or sauerkraut. Some hot dogs are bland, while others are highly seasoned.