SD, referring to the phrase small dick. Obviously someone nicknamed SD has a small dick. It can be used literally, or as an insult.
Guy 1: What's up SD?
Guy 2: I hate it when you call me that.
Guy 1: But it's true, can't deny the truth!

Guy 1: That Jason is such a SD.
Guy 2: For reals!
by rice4lyfeinda415 May 7, 2009
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Super-deformed. In anime and manga, when a character is drawn cartoonishly short, about 3 heads high and has deexagerated limbs (i.e. having mitt-like hands, or long stubs for arms). Characters are often shown super-deformed when characters get in comical situations. Often used interexchangibly with chibi, though technically, they're twoi separate, yet similar things.
by Danny Sotelo May 5, 2003
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Sugar Daddy. This is commonly used for males with $, advertising/postiong, looking for companionship.
Any ladies in South Burbs 18-25 yo $eeking a SD?
by Spider8008 October 30, 2011
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A abbreviation for "suck dick", it can be altered to correctly fit the sentence gramatically.

The term was originally coined by Aren, who used it with the letter M in the middle, rendering it SMD, "suck my dick".
"Go SD you fag!"

Person 1: "Fuck you!"
Person 2: "S my D bitch."

"Have you ever S'ed D?"

Angry Student: "SMD"
Teacher: "What?"
by go S a D December 24, 2005
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Shall we meet for an SD walk?
I went to an SD garden party.
There was no SD at that illegal rave.Did you see the non existent SD on the beaches?
by Wemyssy June 26, 2020
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Secure Digital, probably the best solid-state memory cards money can buy, Faster and safer than XD, CF, Super CF, and MMC
I bought a 64 MB SD card for my Digi-Cam.........Dude excellent choice!
by Nik Canning August 18, 2003
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