Meaning
A texting abbreviation for 'shaking my head' — typed to show disappointment, disbelief, or disapproval at something foolish or vexing. Used in chat and social media exactly as elsewhere, alongside Jamaican shorthand like 'kmt' (kiss mi teeth) and 'dwl' (dead wid laugh).
Examples
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Him do it again? smh.
He did it again? (shaking my head in disbelief)
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smh, dem people never learn.
(shaking my head), those people never learn.
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She just reply 'smh' an lef.
She just replied 'smh' and left.
Origin
An initialism of 'shaking my head' (also 'smdh' = shaking my damn head); global chat shorthand used in Jamaican texting.
How it’s used
Texting shorthand for disappointment/disbelief. Compare 'kmt', 'dwl' (Jamaican-specific ones).