A person who makes facial expressions based on what they are thinking about. Usually unaware they do so, or simply don't care.
Johnny: *sneers at nothing in particular.*
Dave: What the hell is up with Johnny's face?
Marc: Oh, he's just a face thinker, don't worry about it.
Dave: What the hell is up with Johnny's face?
Marc: Oh, he's just a face thinker, don't worry about it.
by Hypok November 7, 2016