An order for food that's extra large or bigger than usual is called "supersize." This often means the customer wants more of everything.
You might hear someone say they want their burger supersized, which means it'll come with a bigger bun, more patty, and more toppings. Some restaurants offer supersizing as an option to make meals larger for people who are very hungry or want extra value. It's usually not free, though - you have to pay a little bit extra. If someone orders a supersized meal, they're probably expecting it to be bigger than the regular size, with more food on their plate.
To increase the size of something, especially to unusual proportions.
