Source : Webster's Revised Unabridged Dictionary (1913)

Tubby \Tub"by\, a.
   Resembling a tub; specifically sounding dull and without
   resonance, like a tub; wanting elasticity or freedom of
   sound; as, a tubby violin.

Source : WordNet®

tubby
     adj : short and fat [syn: {dumpy}, {podgy}, {pudgy}]
     [also: {tubbiest}, {tubbier}]