Best definition
wtf face
1) the face made when wtfery is spoken
2) a blown faceoften following the words or with the words what the

fuck or what the hell

Guy 1: dude i spent the night with a girl

Guy 2: u swack the joint

Guy 1: nah we just talked

Guy 2: wtf *wtf face*

wtf face: define #2
WTF Face
Describes a person with a face that looks like they have been inbred, and/or are just straight up ugly enough to cause you to take many double takes and/or talk shit about how disgustingly hideous they are.
-“Holy shit, that chick is ugly.”

-“Damn, she got a WTF face.”