The term "SMD while I SMH" is an acronym for "Suck my dick while I shake my head.
Megan Fox: "Wanna put it in my butt?"

Tyler Bourk: "Nah bitch, smd while I smh."
by stevesuperawesomeamazingnguyen September 29, 2010
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SMD while I SMH literally means, suck my dick while I shake my head. It's a word that describes your utter disappointment for blatantly disrespectful dick riders.
Dumbo: "Shut up dork"
thatboytweaking100%: "I thought you had something better to say. SMD while I SMH"
by thatboytweaking100% January 1, 2022
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