One that is, and often should be, involved in many social gatherings, happenings and general goings-on. This individual, though frequently without effort or understanding, is the center of the party, and is, by a matter of course, always consulted before any proceeding of a social nature. This person is, by definition, the SHIT.
Kelly: Hey Stacey, let's see what Steve's doing tonight.
Stacey: Yeah, he's probably got a great party planned; what a social INcast! (Giggles uncontrollably).