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2.
Someone who has a face resembling a back. They usually have acne and a very flat, ugly face.
Eww your girlfriend is a backface!
by AnnaY November 26, 2007
 
1.
The region located at the back of your head. Usually used when one feels pain or hurts the back of their head.
Aw man, I just got punched in the back face.
by Bryan February 10, 2005