A person, or group of people, that really have no value to hang around with or be
associated with. Either they are hideous, or they do things that really nobody should want to be a part of. (Taken
literally, if someone was a "shit-fucker", or gay, this is
something nobody would want to be a part of.)
Arose from the distaste for a certain sorority filled with terribly ugly and fat girls which nobody should want to join because they are rather uncool.