Sweetmeat is the testicle of the animal, usually a bull. It is not sweet, has a very strong flavor. It is a southern term, mainly deep south like Mississippi and alike. It can also refer to the pancreas or spleen of a young bull.
Sweetmeats are usually referring to a candied fruit, such as pineapples, that are considered a delicacy.
Testicals
A sweetmeat is a candy
When sold commercially, the thymus gland is referred to as "sweetbread" or "sweetmeat" depending on the region. This can be confused with the spleen, which may also be sold under the commercial name of "sweetmeat". In the live animal, it is simply referred to as the thymus.
Sweetmeat actually doesn't come from an animal. The term 'sweetmeat' refers to a way of preserving nuts/fruits with sugar. What you are thinking of is 'sweetbreads'. Sweetbreads are taken from the thymus gland, pancreas or genitalia of young animals, most often calves, pigs or lambs. They are roundish in shape and are a favorite ingredient in many European dishes. Additionally, my Good Housekeeping cookbook categorizes cow brains as sweetbreads, so it may be used more broadly to refer to traditionally unused animal parts in American Cooking.
bon bon
it means "uncivilized"
Many different confections are made with sugar and almonds. "Sweetmeat" is a generic term for candies, cakes, cookies, etc.
Marzipan
Any sweet delicacy in a tree
shortcake
candy confit confectionery
Halma
halva