Someone who is a combination of chubby and fat; quite a large body, and an obnoxiously chubby face; will almost always have a poor attitude and grating laugh, which will set the undoubtedly multiple chins into motion
"WTF, who took a dump all over my bed?"
"Ah, your flubby roommate."
The flubbies came to visit last week, and ate all my food.
Dude, stop eating that. You're being totally flubular.