What does it mean if you are stuffing your cheeks?
To stuff your cheeks is to put too much food in your mouth at one time.
Some animals, such as Hamadryas Baboons, have large cheeks and can store a lot of food in their mouth. Hamsters and Gophers have pockets in their cheeks to store nuts.

Hamadryas Baboon

Hamadryas Baboon
Photographer: Martina Nicolls
Martina Nicolls: SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM