A term coined by "The Todd," a perverted character on the hit tv comedy "Scrubs."
To interpret a slap on the face as a misplaced high-five.
Carla: Why is my stapler on the floor?
She bends over to retrieve it, revealing a slight peeping thong
Carla whips around and slaps him.
Todd: Face-five! Oh, yeah!
I tried to look up that chick's skirt and she gave me a face five for effort!