GREASY

A person of whom has revolting breath and doesn't understand the concept of chewing gum or mouth wash.

Or

A person who has a circulatory system litterally made of grease

Both aren't mutually exclusive however

Person 1:"FUCK OFF GREASY"

Person 2:"GREASY YOUR NOT ALLOWED IN MY ROOM WITHOUT PARACETAMOL"

Person 3:"SHUT THE FUCK UP BUTTERBOY"