[Facepalm emoji] (3)

I think it could be either:

smh

doh

(Other definitions for doh that I've seen before include "Stupid me!" , "acknowledgment of stupidity" , "First and eighth note in tonic sol-fa" , "First note of tonic sol-fa scale" , "whoops!" .)

I've seen this clue in The New York Times and the USA Today.

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