Does the word "stack" refer to the size of the food? Or the numbers of the food?
The word "stack" refers to if you can place something on top of one another. In this case, if you place tacos on top of one another, they become a stack. So "a whole stack" means a large number of tacos placed on top of each other. The word "stack" can refer to food or other objects and items that are "stackable". Ex: There's a stack of books that need to be put on the shelf. Ex: Wow! That's an impressive stack of pancakes. Is that chocolate syrup? Ex: There's a stack of hay in the barn. Go get some for the horses!
Aprende más expresiones típicas del inglés. >