As I was searching through the Merriam Webster's online dictionary (no need to ask why, just know that I was), I come across a little something that made me laugh and will hopefully amuse you folks as well.

facepalm
(verb) : to slap or cover one's face with one's hand or hands to express frustration, disapproval, or embarrassment
Submitted by: Anonymous on May. 08, 2009 21:59

EDIT: Also, I checked. The word "headdesk" is there too. Commence uproarious laughter.