demonym of people from the United States. It's a reference to their infatuation of fast food hamburgers made from questionable sources, their unintellectual obsession with basing complicated economic matters on the price of a McDonald's Big Mac, and the fact that the United States has one of the highest obesity rates in the world.
Burger: "I support bombing other countries because the United States is the greatest country in the world."
Rest of the world: "Shut up, you stupid burger."
*U.S. empire collapses*