The structure is an initialism standing for "Shaking My Head." It is used to express disappointment, disbelief, frustration, or mild annoyance at something foolish or ridiculous. People typically type "SMH" in response to a bad take, a silly mistake, or a frustrating situation, such as "He tried to microwave metal, SMH" or "SMH I can't believe they canceled the show."

英語での「shaking my head」の定義と意味

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