They meant multiple pepperoni
When ordering food, be as detailed as possible. For example, you can’t just state that you want a pepperoni pizza. You must specify how many pepperoni pieces you wish on your pizza.
This image makes it appear as though the person in it is attempting to consume an entire pepperoni pizza. They ordered a pepperoni pizza because they wanted one. What they got was not precisely what they had imagined, but it’s difficult to argue that this isn’t a pepperoni pizza. Did they make a mistake? In terms of fact, no. However, it appears that they came up just short.