n. a mix of obese and beast, a person who is so disgusting and fat
2.) Ewww Sarah is so obeast it nauseates me.
Also, someone who moves similar to a wild animal due to their condition. This may elicit fear or shock in those he / she comes in contact with.
Tim: "Yeah that guy was obeast!."
Doug: "Kelly, slow down on that hamburger before you become obeast!"