facepalm

or face palm,or face-palm

[feys-pahm]Slang.
noun
  1. the gesture of placing the palm of one's hand across the face, as to express embarrassment, frustration, disbelief, etc. (often used as an interjection): She read the post and comments and did a facepalm. Okay, that was dumb—facepalm!
verb (used without object)
  1. to use this gesture to express such emotions.

Origin of facepalm

First recorded in 2000–05; face + palm1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018