An acronym which is a variant of SMH; it means "shaking my damn head."
Paris Hilton was released from jail after three days, SMDH.
by Metaview June 22, 2007
An acronym standing for "shaking my damn head"; usually typed on blogs or in text messages to express disappointment, sadness, disgust etc.

Also known as SMH standing for "shaking my head"
"I hate to see really fat people try to wear too little clothes." SMDH
by Mrs. Judy March 24, 2009
An acronym which is a variant of SMH; it means "shaking my dog's hand."
Whenever someone types "SMDH," I assume they mean "shaking my dog's hand." Aw, cute dog!
by turncoat May 05, 2014
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".
by AnwarSadat94 May 14, 2011
originally meaning, "Silently Masturbating During Homework", smdh now means "Shaking My Damn Head". You could argue it still means the same thing.
A: I always smdh, especially when studying for finals
B: oh, you shake your damn head cuz studying's so stressful.
A: um, sure, lets go with that.
by Yeeeaaah! October 20, 2011
Means "shaking my dick head." Used when referring to masturbating
Friend: "Hey, wanna come over?"
Me: "Give me 5 minutes... smdh"
by Sr_Papacito December 04, 2011
It means "shake my dick head". But you also have to say "SMDH at you," otherwise, you would just be shaking it for no apparent reason except to get off. So, it basically means the same thing as the original except more of a tisk tisk with exposed genitalia.
Dude 1-"Man, I lost that chick's number from the other night!"
Dude 2-"Sigh...smDh at you."
by CaryGrant April 18, 2011

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