Itis

[Sarah]

The drowsy sleepy feeling you get after eating a large meal. Usual meals like big Sunday dinners, Thanksgiving and Christmas meals.

[Sonia]

verb. i-tiss
Drowsy or sleepy effect linked to digesting large meals, usually high in fat or salt content.
Note: The digestive system uses roughly 60% of your energy while you idle about daily, so after eating large meals the digestive system takes energy from other areas of the body, allowing it to work faster, and bringing about a sleepy effect.

[Raeanne Dimick]

Forming names of inflammatory diseases.