PIG is an acronym meaning "Perpetual Ice Girl." A PIG is a babe who seems to always have a look on her face as if she is pissed-off and usually, when approached, she acts annoyed possibly because of the fact that she knows of her status as a babe. Usually the only chance approaching one of these women with the intent to get in good with her is to try and complain about something whilst in her presence. If she feels like she can help, maybe she will put in her two cents and feel like she has accomplished something. You have established a rapport. She will undoubtedly have "hand" (the upper hand, an idea which may require its own explanation). Only after some time will a person be able to gain hand over a PIG which is the only way to maintain a relationship with respect to these women. In nearly all cases, going to any lengths to acquire a PIG for any purpose (meaningful or purely superficial) is simply not worth the time, effort, mental anguish and eventual unbearable embarrassment.
"Holy shit, dude! That babe over there is such a fucking PIG! I wouldn't touch that with a goddamned 30 foot pole."