facepalm

peittää päänsä kämmenellä A gesture of bringing one palm or both palms to the face, with various interpretations.
(quote-book)
(quote-journal)
To bring the palm of one’s hand to one’s face as an expression of mixed humor and disbelief or disgust or shame, for example, when one is caught off-guard with a particularly bad pun.
To bring one’s face down to one’s cupped hand or hands.