What does "butterball" mean?

A round lump of a coagulated fat used in cooking such as butter or margarine.

Butterball

Common synonyms include: blubbo, blubbo, bucephala albeola, bucephela albeola, bufflehead, bufflehead.

noun, slang

noun, slang ·3 syllables ·Moderate ·College level

Noun

1
A round lump of a coagulated fat used in cooking such as butter or margarine.
2
small North American diving duck; males have bushy head plumage wordnet
3
An overweight person. derogatory, slang
"What if your baby is a butterball? Does Fat-Proofing mean you should put your infant on diet?."
4
a rotund individual wordnet
5
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."