The art mastered by complete dipshits of stealing and attempting to own one's friends. The said friendwhorer would, naturally, be possessive of the stolen friends, treating them like property.
Person #1: "Hey, that's MY friend!"
Friendwhorer: (to Person #1) BACK UP DOOKIE! (to Person #1's recently friendwhored friend) Get in the car, I have candy. Oh, and never talk to that wank again."