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1.
Doyf is a slang term which means slapping the face using the male genitalia.
Simon: i had this hot chick at mine last night!
Mark: oh yeah? what happened?
Simon: well... she turned out to be a guy and then doyfed me across the face!
by Charleybby November 19, 2008
 
2.
Dick on your face. When a man slaps a woman in the face with his penis.
That girl kept on talking so I had to doyf her. I doyfed her last night.
by Greek November 02, 2005