Middle Chick

Middle chick is a girl your talking to that your not sure about. Sure you'd like to have sex with her but your not 100% sure about it for various reasons including how much you actually like her, how crazy she is, etc.

I been talking to Jane but ehh shes a middle chick so who knows whats going happen, shes got lots of potential.

or

John keeps wasting time on that middle chick.