chubby /ˈt͡ʃʌbi/noun 4adjective 2forms 3 noun4 •A chubby, plump person.The chubby is especially taken for granted: "Hey, can you watch my purse while I dance?" — 2007 •(slang) An overweight or obese gay man. •(slang) A penile erection, especially when short and with a large circumference; a boner.Hey, Lucius, I just wanted to share a piece of personal information with you. I've got a... a chubby right now because [starts screaming] This is one of the most awesome experiences of my life! — 2006 •A type of thickly-padded fur jacket. adjective2 •Of a person: slightly overweight, somewhat fat, and hence plump, rounded, and soft.Obviously the chubby child was eating too much. •Of a body part: containing a moderate amount of fat.It’s quite normal for babies to have chubby cheeks. formschubbies · chubbier · chubbiest