Correct spelling for the English word "motton" is [mˈɒtən], [mˈɒtən], [m_ˈɒ_t_ə_n] (IPA phonetic alphabet).
There does not seem to be a specific word called "motton" in the English language. It is possible that you may have misspelled the word or it could be a regional or slang term. However, there is a word called "mutton" which is widely recognized and could potentially be what you are referring to.
Mutton is a noun that refers to the flesh of mature sheep used as food. It can also refer to the sheep itself. The term specifically denotes the meat that comes from sheep over the age of one year and is typically darker and more flavorful compared to lamb, which is the meat of young sheep.
In culinary terms, mutton is often used in stews, curries, and roasts, as it contains more fat and connective tissue, which enhances the flavor and tenderness when cooked slowly over a longer period of time. Mutton meat can vary in taste and texture depending on the breed of sheep, the animal's diet, and the method of preparation.
Outside of its culinary usage, the term mutton is also occasionally used metaphorically to describe a person who is aging or past their prime, particularly in relation to their physical appearance. This metaphorical usage is derived from the fact that mutton is associated with older and more mature sheep.