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Deriving from the ever popular SMH, SMHALATST means "Shake my head and laugh at the same time." This is usually used in cases involving a question,statement, or event that is too absurd or stupid to dignify solely with a simple SMH or an LOL.
Person 1: Dude, I just stepped in dog crap...
Person 2: What?! SMHALATST.
by Silpy February 16, 2011
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