Noun or Verb
Some people say that Barbecue is the meat, usually pork or beef, that is grilled or smoked and slathered in sauce, making "Barbecue" a noun. Also the word has been used for a place,event where one acquires the aforementioned meat, also making "Barbecue" a noun. The pit, smoker, or device used to cook the meat, is again a noun. Many believe that the noun, "Barbecue" also includes hot dogs, hamburgers, etc. cooked over a grill. Although it is a noun, barbecue purists scoff at the idea.
There are many others who use the word "Barbecue" as a verb. They may use it to describe the act of cooking, grilling, roasting the meat described above as barbecue, i.e. "Barbecued" or "Barbecueing". Some extend the meaning as the act of cooking anything on a grill or in a smoker, i.e. "I'm barbecuing some burgers and hot dogs."
Barbecue professionals and serious enthusiast overwhelmingly reject that burgers, hot dogs or other food, merely cooked on a grill are not barbecue. However, they are split on whether "Barbecue" can be used as a verb in a limited context. The act of actually preparing and grilling or smoking meat, i.e. "I'm barbecuing a brisket." Some insist that the act of cooking the meat should be referred to using the verbs, "grill" or "smoke" and that the noun "Barbecue" refers to the end product of those actions. Whatever side of this definition of "Barbecue" you are on, cooking outdoors is fun and barbecue is amazingly tasty.