Basically a person that you just refer as a dumb bitch, S.W Means Stupid Whore, you can uses S.W to insult someone who wouldn't even know what your talking about, use this on your enemies, or you could jokingly use this on friends but before you insult them to their faces, please tell them that you are only joking so that way the do not stop being your friends because that would probably suck.
Derived from the acronym for "Single white female". Refers to the movie "Single White Female", where a new roommate tries to take over the Protagonist's life.
This term is used when a crazy person attempts to take over someone's life.