What is Girlfriend In Training?
1.
A female companion that is more than a friend, but not quite a full fledged girlfriend. Often is followed by becoming a full fledged girlfriend.
My girlfriend in training and I are talking about taking the next step and going out.
See
2.
A relatively sexually inexperienced girl; whom, upon becoming your girlfriend will require a bit of assistance as to how to properly get your mojo workin'.
Guy #1: How's your new chickie?
Guy #2: Dude, I had to spend 45 minutes showing her how to properly hold the goods while hand jobbin me.
Guy #1: Well... she is a girlfriend in training after all...
See
3.
(N.) A female who is still just a friend. A future Girlfriend and often, a future ex-girlfriend.
Melissa is no longer a girlfriend in training. But you say she just a friend.
4.
A naive, usually
Watch out! Your girlfriend in training is starting to wear a bra.