A Ham

1. (anatomy) The region back of the knee joint; the popliteal space; the hock.
2. (countable) A thigh and buttock of an animal slaughtered for meat.
3. (uncountable) Meat from the thigh of a hog cured for food. https://en.wikipedia.org/wiki/Ham
4. The back of the thigh.
5. (Internet, informal, uncommon) Electronic mail that is wanted; mail that is not spam or junk mail. Antonym: spam