My girlfriend calls it her "cooter" in the bedroom and just uses "vagina" if she mentions it at other times. She doesn't like me to call it her pussy or cunt for some reason. I'm not crazy about saying "cooter" but hey, it's her cunt and she can ask me to call it whatever she wants, I guess.
(She's from Missouri, but not the hillbilly part. Not sure if that has something to do with it. Just sayin'...)