A Smoker box is a metal box filled with wood chips to give a smoke flavor to foods. It's one of many articles deleted from Wikipedia. (it should at least be a redirect to the Barbecue Grill article) You will find it described as "A small metal box containing wood chips may be used on a gas grill to give a smoky flavor to the grilled foods".
Or you can use Google and Google images
Just another thing not on Wikipedia. .Yes, a small group of somebody actually felt it was important to delete the Smoker box. (not simply change it to a redirect)
So now if somebody types in "Smoker Box" on Wikipedia it asks "did you mean smother box". Which is an article that is not notable, pornographic in nature, and unlike a smoker box, not even in existence.
See Wikigroaning (which is also something not found on Wikipedia)