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a SDB is any female that exhibits traits of a STUPID DUMB BITCH. they are almost always either skanks or wont give you shit for pleasure. their diet consists of 97.75% bullshit and no matter what you should never date them.
John: Yo bro did i hook up with that annoying drunk bitch at that party last night?!?!

Derek: Yeah man you hooked up with that SDB hahaha!!!!, but dude how fucked up were you???

John: I obviously don't remember and i don't want to talk about it...
by Joesin March 24, 2011
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2
Stupid Dumb Bitch
Generally seen driving S.U.V's, the S.D.B.'s native habitat is gentrified areas, suburbs, the mall, Grocery stores, under their boss's desk, under their husband's desk, under my desk.
That F***ING SBD cut me off! Get the gat.
by the search September 23, 2003
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3
Sick, Disgusting, Blob.

Means that someone is a sick disgusting fuck who thinks about sick disgusting things and likes to call random people paedophiles. A SDB will make a joke out of it and they think it's funny when the reality is there are REAL sick paedophiles out in the world. SDB's will get their ass kicked..
Those are some classy people, those SDB's.
by youdisgustme123 February 17, 2013
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SDB means synd det Blommeh. It's a Norwegian saying of friend zoned. Or a creep that don't take no for an answer
by Catliver_billy September 22, 2016
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Abbreviation for silly duffer brother.

SDB can be used as a noun or adjective to describe an extremely idiotic person (also a nitwit or fool) or an extremely idiotic action.

SDB combines Aussie slang (silly duffer) and incorporates a reference to the world renowned Duffer Brothers (American twin brothers who write and direct science fiction films, horror films and television shows - including Stranger Things).
Board member 1: "The Chairman isn't wearing any pants!"

Board member 2: "He's such an SDB!"
by Horatio Bumbus July 27, 2017
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Sucks Donkey Balls (usually used in online discussions), indicating the topic under consideration is really, really horrible.
Oh man, that playaz' web forum SDB
by Blorf May 31, 2005
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