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1.
In basketball, dunking in the face of an opposing player; a posterization. generally entails an aggressive or acrobatic dunk or move to the basket. Popularized by the ESPN show "SportsNation"
Did you ever see when Vince Carter jumped over that 7 foot guy and dunked in the Olympics? Best dunkface ever!
by Magnus von Slaughterhausen February 25, 2010
 
2.
(noun) The facial expression someone makes before, during, and/or after performing a slam dunk. This is usually either a look of berserk intensity or hilarious absurdity.
Did you see that!?!?!?... Lebron's dunk face was redunkulous!!!!!!
by bballicious23 October 07, 2010