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This is an Acronym that originally meant "Silently [Masturbating] During Homework". It was converted into "Shaking My Damn Head" when a [Facebook member] who often used this term was asked, "What does that mean?". The [individual] responded with a quick and witty answer. "Shaking My Damn Head". The individual who asked what SMDH means responded, "You sure do shake your damn head a lot".
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