Definition of chubby:
(adj) :
of a person, slightly
overweight, somewhat
fat; of a part of the body, containing a moderate amount of fat
"it was obvious that the chubby child was eating too much."
"hey, Lucius, I just wanted to share a piece of personal information with you. I've got a... a chubby right now because [starts creaming] This is one of the most awesome experiences of my life!&mdash"