2-Faced

A person who may be your friend but makes the decision to turn and talk about you behind you back. You may think they are your friends but you find out they had been talking about you. It is never good things it is negative thing that get spoken about you.

Definition:

Jennifer: Hi Lauren have you seen Lucy around lately?
Lauren: No. I though you weren't her friend.
Jennifer: No, what made you think that?
Lauren: She told me she didnt like you and your annoying and loads of other mean stuff
Jennifer: What?!
Lauren: Yeah. Shes 2-Faced.