Z-Man is an American burger originating from Kansas City. It consists of a split Kaiser roll that's filed with sliced smoked brisket, smoked provolone cheese, onion rings, and barbecue sauce. This burger was invented at a barbecue joint called Joe's Kansas City Bar-B-Que.
Jeff, the owner, went to Zarrick, a sports talk show host on the local radio station, and asked him to talk about this new burger. The listeners chose the name as they began regularly asking for that Z-Man sandwich on the air, referring to Zarrick, who had begun calling himself Z-Man not long before.