A seat whore is when you and your friends are together at some kind of event and one of you is left out. This person then tries to move from the outside of the conversation to the very middle of it by moving into where everyone is, pushing someone out of the way and taking their seat. Seat whores are usually very anti social and cannot start up a good conversation. Seat whores and attention whores tend to get along very well.
Thomas: Hey guys, what are you talking about over there?
(Chris, Jason, Jack, Steven, and Adam keep on talking)
Thomas: Hey over here!
(Thomas shoves Steven and Jack out of the way)
Thomas: Whats up?!?!?
Chris: You are such a fucking seat whore Thomas