A usually obese (fatass) child, who thinks that he has many friends, but truly everyone hates him. Leave it to him to ruin a party or social event, usually hogging all of the snacks and food, and later throwing up somewhere other than the bathroom.
Tom: Hey, there's a new kid in school.
Jared: He's fat, ugly, and thinks he has friends.
Tom: Oh, he must be a nasty colli.