Definition of facepalm in English:

facepalm

noun

informal
  • [often as exclamation] A gesture in which the palm of one's hand is brought to one's face as an expression of dismay, exasperation, embarrassment, etc.

    ‘I'm pretty sure said friend now thinks Anne and I are dating—facepalm!’
    ‘you have to see this one to believe it—it definitely merits the double facepalm’
    • ‘The facepalm is as much for mike who fell for it hook, line and sinker.’
    • ‘Facepalm?’
    • ‘facepalm (It's not quite as bad as it sounds two classes got cancelled but still, that's more skipping than I've done all year.)’
    • ‘facepalm Just because I pay for her and she calls me "dear" and we hold hands yeah, I have no leg to stand on here.’
    • ‘I could not help but notice that his front seat passenger had already adopted the position known as the "facepalm".’
    • ‘facepalm Cardigans are VERY IMPORTANT to me, okay?’
    • ‘But alas. *Facepalm*’
    • ‘Facepalm indeed.’
    • ‘Facepalm so hard.’
    • ‘facepalm Having said that?’

verb

[NO OBJECT]informal
  • Bring the palm of one's hand to one's face as an expression of dismay, exasperation, embarrassment, etc.

    ‘did anyone else facepalm during this scene?’
    • ‘I double facepalmed.’
    • ‘However, a lot of cops, when they see something like this, facepalm and say "Those cops give people like me an EXTREMELY bad name!"’

Pronunciation:

facepalm

/ˈfeɪspɑːm/