During oral sex a man pulls his erect penis out of his partners mouth and proceeds to use it as a saliva and/or semen wiper back and forth across his partners entire face in an (erotic) attempt to wipe his partners face.
Guy 1 - "This chick I really like is a Windshield Wiper Face"
Guy 2 - "You mean good blowjob's?"
Guy 1 - "She had me do the windshield wiper to her face so many times during oral sex last night that that I lost count!"
Guy 2 - "She's a keeper!"