coined by Claudia C. from DTLA, it's a person (mostly a guy) who pretends he's a friend but acts otherwise; a person who does major cock-blocking and tries to isolate you in a group event or away from your friends; a person who seems cool and dateable at first but actually is a stalker in training; a person you should really stay away from.
1. "what happened to that guy you were dating?"
"oh, he turned out to be a total fail face. NEXT!"
2. "omg, fail face is over there. RUUUUUUN!"