butterball

noun

Etymology: From butter + ball.

1. A round lump of a coagulated fat used in cooking such as butter or margarine.
2. An overweight person.

   “What if your baby is a butterball? Does Fat-Proofing mean you should put your infant on diet?.”

3. A small North American duck, the bufflehead, Bucephala albeola.

   “The skipper had his eye on a bunch of butterballs feeding not far from the boat. In fact there were ducks all around — though he did not tell me so.”

4. A turkey.