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1.
A face of disbelief or shock, where someone points to their face and keeps a straight or distraught face.
Sam: I just got abducted by aliens.
Sean: *blown face*
by BlownFace September 20, 2007
 
2.
When someone has something so bad happen to them that their face becomes an expression of such shock and disbelief.
Guy #1: Dude, I just walked into my apartment and found my girlfriend banging another dude in our kitchen.

Guy #2: BLOWN FACE!
by Midgetyman5670 November 04, 2009