A person facepalming — hand pressed flat against the forehead — the internet's universal shorthand for 'I can't believe this' exasperation, secondhand embarrassment, or reacting to someone else's dumb mistake. It exploded in popularity even before it existed as an official emoji, driven by the viral Star Trek 'Picard facepalm' meme. Trivia: this was one of the most heavily lobbied-for emoji in Unicode history — a dedicated online campaign in 2014-2015 pushed hard for its inclusion, and it finally landed in Unicode 9.0 (2016).
Keywords: again, bewilder, disbelief, exasperation, facepalm, no, not, oh, omg, person, shock, smh