Top definition
Acronym for the phrase, "Shaking my head at your dumb ass"
Shortcut for people who are truly too stunned for words at another person's obvious total lack of intelligence where using smh or smmfh will not be adequate.

"Well, if all the kids in schools were trained how to shoot, there would be no more school shootings."

"smhayda"
by modans55 February 15, 2013
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