Diet Coke

Diet Coke – beverage of choice for people who think that by drinking diet soda they’re on a hardcore diet.
Ex: "I'll have 2 Big Macs, a quarter pounder with cheese, a Filet 'O Fish, 3 large fries, a Shamrock shake (it's March) whatever's left in that fryer over there, 2 apple pies, and.... a Diet Coke. I'm on a diet."