Top definition
An abbreviation of "Shaking my head in despair".

Used in times when you really cannot believe what has happened. Perhaps used more to pity someones stupidness.
"Stu: I just got sacked from my job
Sam: HAHAHAH Why mate?
Stu: Because I created a Facebook group that slated the place.
Sam: you idiot, smhid".
by Sam Cornwell May 30, 2008
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