The Collaborative International Dictionary of English v.0.48:
Chubby \Chub"by\, a. Like a chub; plump, short, and thick. "Chubby faces." --I. Taylor. [1913 Webster]WordNet (r) 3.0 (2006):
chubby adj 1: sufficiently fat so as to have a pleasing fullness of figure; "a chubby child"; "pleasingly plump"; [syn: chubby, embonpoint, plump]