A term used to describe two very close females, usually bestfriends who if were lesbian, would have the greatest relationship ever.
Similar to manpanions and bumchums in the case of guy bestfriends.
Kirstyn: Do you wana be my vachina forever?
Robyn: ah man I was about to ask you the same thing!
Paul: Dude, are those chicks lesbians over there?
Tom: No ways man they're vachinas
Paul: oh yeah, yr right how could i have been so ignorant