SDD 

SDD stands for Slightly Drunk Driver.

Very similar to a designated driver. The SDD will still drink but they will not get as wasted as their friends.

Because being sober around people that drunk is no fun.

Friend 1: Hey, wanna do a shot?

Friend 2: No thanks, I'm sticking to beer. I'm the SDD tonight.

SDD by squidipus March 15, 2009

SDD 

Serious Deep Dicking.

"Lucy always loved a bit of SDD."

SDD by PsYko May 13, 2005

SDD 

Suck Daddy's Dick

Hey you, go SDD.

SDD by Ginfasio38 January 13, 2011

SDD 

Acryonym for "Software Design and Development", a HSC subject. Basically, it sucks, and should be avoided at all costs. Even the teachers who teach it will tell you not to enrol in it because it sucks. For the tiny bit of programming you actually get to do, you'll have to use some terrible MS language like VB or C#, but most of the subject is incomprehensible project management mumbo jumbo.

"I skipped SDD today so that I could sleep in for an extra hour and a half."
"I dropped SDD and picked up ext2 English in year 12 and am now doing CS at uni. What a good decision!"

SDD by Phineas Phreak April 28, 2005

SDD 

SDD means small dick disorder.

Example- Floyd Mayweather has SDD.

SDD by Jisun September 15, 2017

SDD 

Soft Dick Dennis When under the influence and attempting to preform sexual intercourse the penis may become inerectile.

"fuck Samantha I had a SDD again last night, I need to stop smashing drunk fucks"

SDD by thatbitch2121 May 4, 2019

SDD 

(n.)--Sarcasm Detection Disorder. The inability to properly assign sarcastic intent to electronically transferred words. Often occurring on AIM, Facebook, and other online chat forums. Usually results in confusion and hurt feelings.

Sam24: Say Elle, I'm going to rape you up the butt.
Elle92: I'm going to sic the NYPD and the Russian mafia onto your ass.
Sam24: Whaaattt? It was a joke! You are suffering from some major SDD, hoe.
Elle92: ur a jerk

SDD by EmiliaLorena August 23, 2008