Two face

Two-faced is used to describe someone who is increasingly "mixy". If your friend has two faces, that means that he/she will act cool with you, and then switch up like nothing. Two-faced can describe people who snitch on you, talk about you behind your back, or just switch up out of nowhere. Two-faced is used interchangeably with terms such as "fake", "mixy", "oppy", "ratty", etc.

"Niggas looked at me with one eye when they said shit. I can't trust two faces" - AMU Henry Smalls