What this stands for depends on whether or not you're 13 years old, or not.

If you're a hobbyist (like myself) who likes working with printed circuit boards (PCBs), SMD stands for Surface Mount Device, which are devices that are soldered onto the board from only one side, in contrast to THT (Through Hole Technology) devices.

And if you're a prepubescent 13 year old, I suppose SMD stands for "suck my dick", just like everyone else who has defined this term thus far on here...
Veteran hobbyist: "Have you done any soldering with SMDs before?"

13 year old dumbass: "OLOLOOL FGT SMD!111!!11"
by VectorFluxion January 1, 2021
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An acronym for "Sure My Dear".
This acronym was invented by a famous YouTuber based in the U.A.E called Zubair Sarookh.
This acronym originated in Zubair's popular series 'PARENT TEACHER MEETING' in part 1, where Zubair's teacher is talking to Zubair's father about Zubair's performance in school. Zubair's teacher tells his father that Zubair told the teacher "S M D" when the teacher asked him to do his homework and come to school. Zubair defended himself that he actually meant "Sure My Dear", and not what you think it was. To this day, it's a popular acronym in some of Zubair Sarookh's videos.
PARENT TEACHER MEETING - Zubair Sarookh, 1:28

Zubair's Teacher (talking to Zubair's father): "Few days back I tell Zubair, 'Do your homework and come.' He said 'S M D'. I say 'What is S M D?' He say SMD meaning 'Sure My Dear'."

Zubair: "Wallah teacher I meant 'Sure My Dear'."
by A Boeing 737 MAX 8 November 15, 2021
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Shaking My Dick, an acronym in contrast to SMH (Shaking My Head)
"You really annoy me with your opinion. SMH"
"I really don't care. SMD"
by Hugh Geeves Sasheet August 22, 2017
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Abbreviation for "Sell Me Drugs". Used by many when wanting to
a) disguise the true meaning of the phrase "SMD"
b) purchase drugs
c) purchase drugs from someone while having a little "extra fun"
Tom: "Hey, Jack, how about you SMD."

Jack: "No, man, that's disgusting!"

Tom "Geeze, I just wanted some crack."
by Voltron22 August 6, 2012
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Although sometimes thought to have a sexual connotation, SMD can also be used as "Saw/See Me Dominate". Mostly this version of the acronym is used in competitive settings such as a race, or a game.
Wow! Did you SMD in that last cross country race?!

Do you think the other team SMD?
by runXC2013 October 2, 2013
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Stands for Suck My Dick. Origin from Enowww.
"Hey man"

"Hey, whats up?"

"SMD son"
by Wasp2012 May 29, 2012
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