Definition of "chubby"

Slowly Skye wrapped her arms around the chubby woman's frame and rested her head on Rita's chest drenched with perspiration.

2010, Marsha Hubler, The Long Ride Home, Zonderkidz, page 97

The servant to whom he put this question was a young fellow with chubby cheeks, small, dull eyes, and a round chin, covered with a colorless down.

1867, Ivan Sergheïevitch Turgenef [i.e., Ivan Turgenev], chapter I, in Eugene Schuyler, transl., Fathers and Sons […], New York, N.Y.: Leypoldt and Holt, page 1

The chubby is the girl who cannot be fitted in the regular 7 to 14 size range because she is too stout. Sizes for these girls are 7*4 to 141/^, and are specially styled and designed to give them better proportions.

1949, R. Duffy Lewis, Dorothy Stote, How to build an infant's, girls' and teens' wear business: a manual for retailers and prospective shop owners

The chubby is especially taken for granted: "Hey, can you watch my purse while I dance?"

2007, Jackie Guerra, Under Construction: How I've Gained and Lost Millions of Dollars and Hundreds of Pounds, New American Library