The action of slamming your head against a desk, wall, or other hard object because of complete misfortune. Related to facepalm
The last day before Spring Break, when our teacher said we would have the next five days to complete our assignment I headdesked at the complete stupidity of our teacher.
The action of the palm of your hand hitting your face in an "are you kidding me" sort of manor. Normally done when you ask your friend a question and they reply with something stupid or completely not of matter.
When Jessica replied to the "how many states are there?" with "wait, Cuba makes 53 right?" I facepalmed.