"butterballs" in the noun sense
1. fatso, fatty, fat person, roly-poly, butterball
a rotund individual
2. bufflehead, butterball, dipper, Bucephela albeola
small North American diving duck males have bushy head plumage
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License