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 December 31, 2020
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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 06, 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 02, 2013
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An acronym for "suck my dick". Widely used across the intergalactic web, and in general conversation.
intergalactic web:

guy: my mom made me pancakes
dude: ur mom can smd

in real life:

guy: omg you're well ugly man
dude: how about smd?
by izzehWIN_ May 02, 2010
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