V.I.T. or Vag In Training , A girl who is of age, learning how to use her Vag , A.k.a. Vagina for the first time.
Joey: my girlfriend is a VIT until after tonight when I teach her how to use that vag of hers.
Seth: Yeah my girlfriend was a vag in training till a few days ago. Now she is one of the best VAG's ever!