Just head into an Arby's and ask for the Meat Mountain. If they don't know what you're talking about, just let them know you want all of their meats stacked on a bun. Most Arby's honor the Meat Mountain request, but some will not. And it will cost you $10, so go hungry!
The biggest sandwich Arby's has ever sold. Stacked ridiculously high with almost all the meats. Two chicken tenders, slices of roast turkey, pit-smoked ham, corned beef, 13-hour smoked brisket, USDA-choice Angus steak, roast beef, and pepper bacon. There's also cheddar and swiss cheese somewhere in there.