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1.
To continually make a blank expression on your face, even though something dramatic is happening, such as:

-getting laid
-watching your friend eat shit on a skateboard

-winning the lotto
-getting a glimpse of Megan fox's tits
-performing a hiduken

_
Example:

Guy: "hey guys, I just won a million dollars."

Guy 2: "dude you are stefan face-ing the shit outta this moment."
by SiXAXiSMoFo December 06, 2010