Definitions

1. noun

a plump person, especially a child, who is slightly overweight

“The doctor told the mother that her butterball of a son needed to lose a few pounds.”

2. noun

a plump or tender young animal, especially a turkey, that is ready for cooking

“The grocery store had a special on butterballs for Thanksgiving dinner.”

3. verb

to make or become plump or swollen, especially with fat

“The butterball effect is seen in some breeds of dog that are prone to obesity.”