Billy's current most popular nickname: Tub-O.
Someone may be working on fat feline butt. Katherine alternatively calls him Tub-O and then defends him saying he's not overweight, it's just powerful hind legs and his particular coloring.
I mostly comment on that Whitey doesn't go back for seconds and thirds at the dinner dish.
The argument rages on.
[Later ... see Katherine's comment. She thinks it's actually spelled Tubbo.]