Serious Discussion. Used in the internet forums to describe a thread. It is used to discuss serious topics, not for whoring. In this type of threads generally there is a lot of arguing.
(SD) How many more children must die in schools before america says no to guns?
by morrissey02 April 21, 2007
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
Sperm Donor
A male whom thinks he's the shit, does not help with the family, most likely 420 friendly, with many DUI's, is having relations with the neighbor women, and thinks your to stupid to figure it out .Also whom actualy thinks the sun rises and sets for him.
Neighbor to woman: "Where's your man?"

Woman: "Oh you mean my SD, prob at the bar or looking for a 40."

Neighbor: "Ok let him know I stopped by"

Woman: "Sure thing Princess"
by MissPriss73 July 10, 2009
Also Known As A "Smooth Dip" - to dip off in a smooth fashion as to avoid someone.

You im bout to SD on these muthafuckas
by Dave609 April 21, 2008
Acronym for, Slydog
1: someone who gets with sluts when they are already in a relationship.

2: someone who does something on the sly.
Danny I cann't believe you slipped that lass one up the arse when your married. Such a SD you are.

Fucking SD mate, as if you managed to get me 50 condoms without anyone seeig you.
by Dan Bates January 30, 2008
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 17, 2003
Something that is incredibly, mind-numbingly boring. You want to shoot yourself in the face it's that boring.
'Man she is so boring on facebook- her status's are sooo SD'

'I wish he'd stop going on about how having children is going to end his social life. Its starting to be very SD'
by Therealashes June 25, 2009
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