A really fucking fat piece of shit who eats to much and should die of cancer. Usually has no neck and looks like a Thumb Thumb from Spy Kids.
NORMAL KID: Oi Chubby Muffin, Kill yourself you fat cunt, you eat to much and you should die you diabetes fucking prick cunt.
Chubby Muffin: I'm fat so i should die.
When a guy is going down on a girl and she clamps her chubby thighs together,squeezing his head and sealing his ears off leaving him virtually deaf,temporarily.
A:hey whatcha eating B: dude im working on my third big mac
A:what of the week?
B: no of the day!
A:wow what a chubbamuffin
or
A:i dont feel so good man
B:why? you ok man
A: i dont know man i was feeling like a chubbamuffin and a gallon of ice cream.