The Grand Champion or GC at a BBQ contest is the team with the most total points across all the competition categories.
For a typical Kansas City Barbeque Society (KCBS) sanctioned BBQ Competition there are four categories of meat (chicken, pork ribs, pork, and beef brisket). Each category will have a winner. And the team with the best score total from the four categories will be the overall competition winner or Grand Champion.
The Grand Champion will typically receive a big trophy or plaque and a check.