Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Facepalm" Definition
noun
A gesture of bringing one palm or both palms to the face, with various interpretations.
Source: Wiktionary
verb
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.
Source: Wiktionary
To bring one’s face down to one’s cupped hand or hands.
Source: Wiktionary
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