SMDD stands for "Shakin' My Damn Dick!".
Slime: Where did yo bad bitch get that Trukfit shirt?
Me: From SMDD.
by Ray J the Great December 5, 2012
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Shaking my Damn Dangler

(Used in a post of a Rick and Morty tumblr - fedconnect.galacticfederation.com)
by Lucky_Icecube February 3, 2017
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Smdd is a abbreviation of the phrase "Suck my dogs dick"
Guy1: Your a noob.
Guy2: SMDD!
Guy1: What does that mean?
by Werfer July 10, 2011
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Acronym for "shaking my damn dick" for when shaking your damn head isnt enough.
Man Richard flaked again?! SMDD
by Slimy feller December 24, 2017
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