When someone pulls an very arrogant or stupid looking face, wich is so terrible you cannot look at it due to sheer disgust, he/she made a terriface.
Definitions of terriface:
1. A terribly stupid face.
2. A handicapped persons' face.
3. Someone very very ugly.
Dude2: ''Yeah, what a terriface!''
Dude1: ''He wants to hang out with us.''
Dude2: ''Ugh, his terriface will destroy our rep, REFUSED!''
Dude1: ''Hahaha, man did you watch the special olympics?''
Dude2: ''MO' LIKE TERRIFACED OYMPICS!''