Know your facepalm from your headslap
‘That’s not a facepalm,’ said my husband. ‘It’s a headslap.’ He proved the point by making contact between the flat of his hand and his noble brow, producing a percussive sound. Then he covered his eyes with outstretched fingers and said: ‘That’s a facepalm.’ He was right to make a semantic distinction between these two non-verbal gestures. The headslap signifies usually comic frustration at another’s stupidity. The facepalm conveys embarrassment. The names are recent. Facepalm is not found earlier than 1996 in the Oxford English Dictionary. Those who like to employ emojis (which I do not) will find one for the job. The headslap has not yet been noticed by the OED.