A 15-pound (6.8kg) hamburger. Your horror should be tempered by the knowledge that it's meant to feed ten to fifteen people, but still.... And of course there must be a contest to see if anyone can eat the whole thing by himself.
Note the word "Mallett" on the guy's t-shirt. That surely is a reference to what used to be the men's honors dorm at the University of Alabama, in which I resided during my freshman year. (I moved out into an apartment after that.) Sometime later the program ceased to be associated with that specific building, but continued as something called "the Mallett Assembly," and I think it still exists.