Mannequin
A term used to describe an obviously fake person; a person who either looks or acts differently than they make themselves out to appear (usually negative).
Example:
Joe: I heard Nicole had a stress fracture in her leg
Katie: That's weird, I saw her running perfectly fine a few minutes ago.
Joe: Geez, what a mannequin.
Joe: I heard Nicole had a stress fracture in her leg
Katie: That's weird, I saw her running perfectly fine a few minutes ago.
Joe: Geez, what a mannequin.