Fatastasize
(fu-tass-ta-size); the spreading or growing of fat cells in the body caused by the onset of too much food being eaten; the growing of fat cells in the body after eating too much; the process of food becoming fat cells in your body;
Now that I ate the whole pie, I need to lay down and let it fatastasize in me" or "I ate so much that all I can do now is lay here and fatastasize.