Definitions for tubbiness
Random House Webster's College Dictionary
tub•byˈtʌb i(adj.)-bi•er, -bi•est.
short and fat.
having a dull, thumping sound; lacking resonance.
Origin of tubby:
chubbiness, pudginess, tubbiness, rolypoliness(noun)
the property of having a plump and round body
The state of being tubby; chubbiness.