facepalm

(verb) (slang) to put one’s hand on one’s forehead when a stupid thing has been done or a stupid question has been asked

Example Sentences:

I facepalmed when a student asked me if Vancouver was a city in America.

Yesterday, I smashed my car window because my keys were inside. Then I noticed the door was unlocked. *Facepalm*.

From the Blogs:

Morning Facepalm -- Last Time Edition

Media:

Similar idioms:

1. hand-me-down
2. bite the hand that feeds one
3. open the door to
4. live from hand to mouth
5. give someone a hand
6. smashed
7. out of the question
8. window-shop
9. get one’s foot in the door