Source : Webster's Revised Unabridged Dictionary (1913)

Chubby \Chub"by\, a.
   Like a chub; plump, short, and thick. ``Chubby faces.'' --I.
   Taylor.

Source : WordNet®

chubby
     adj : euphemisms for slightly fat; "a generation ago...buxom
           actresses were popular"- Robt.A.Hamilton; "chubby
           babies"; "pleasingly plump" [syn: {buxom}, {embonpoint},
            {plump}, {zaftig}, {zoftig}]
     [also: {chubbiest}, {chubbier}]