The term 'utterly stuffed' can be summarized by the crossword solution 'SATED', which is a five-letter word. SATED is an adjective that means to be completely satisfied or filled, usually after eating a large amount of food. It is often used to describe someone who has eaten so much that they are no longer hungry. Therefore, the term 'utterly stuffed' can be used to describe someone who has eaten so much that they are completely full and satisfied.