Silent But Deadly! unfortunately an all too familiar odor eminating mysteriously around groups of people, survivable outdoors, but toxic in an enclosed space, in which everyone looks around trying to figure out who let rip (even the smirking perpetrator).
sitting in the back of a pick-up truck with a group of friends on our way to lollapalozza, when suddenly the driver's side window rolls quickly down and the driver sticks his head out the window screaming "S.B.D.!S.B.D.!" dousing the front cab with ozone, while the guy riding shotgun is laughing his guilty arse off. if especially deadly, DO NOT be stuck downwind, i.e. in this case, riding in the back of an open truck slowly, or worse, trapped in the car itself.
by AngelWolf May 26, 2006
Stupid Bitch Disease - A disease genetically passed down from Adam that afflicts most men that attracts them to and causes them to deal with and stay with stupid bitches.

It all started in the Garden of Evil when the stupid bitch ate the apple and convinced Adam to do the same which comdemed all mankind to mortal Hell
Tom has got a really bad case of SBD. His girl runs all over him but he keeps coming back. If he’s not careful it’s going to turn into a full blown case of PBD
by dkarez4u August 18, 2011
A Silent But Deadly fart , the kind that might be left behind by some "cropduster" .( See also ; cropduster )
DAMMIT , Jason , that was an SBD !
by Bite-Me April 27, 2008
S.B.D. Sassy Black Dick.

A penis owned by a black man or transgender which one may find attractive and abundant in 'sass'.

The phrase was coined by a SBD lovin' movie enthusiast while queefing over the sole male character in the cult thriller "Devil" (2010).
Daaaaaammmmmnn!!! Dat girl really loves her some SBD! She be goin to work on day awl day erry day! What's her name?

Her name is Alison.
by Tsssssst May 07, 2014
Stupid Bitch Disease - A mental condition (often inherited and semi-contagious) that strikes approximately one out of every three women in their early twenties. Symptoms include sudden and rampant sexual promiscuity,
compulsive lying, erratic mood swings, excessive and frivalous nagging, manipulative behaviour, and all-around evilness. Although there is no known cure, the condition usually lasts only 6-24 months and can be treated with bitch-slap therapy. Some acute cases, though rare, may develop into C.B.D. (Crazy Bitch Disease).
My friend has been really stressed out since his girl caught S.B.D.
by Decepticon September 26, 2004
a silent but pungent instance of flatulence (from silent but deadly)
Damn! He just released a SBD.
by The Return of Light Joker November 06, 2008
ShaunaBaDheka... ranked #1 fool on every planet except Uranus... SBD has the 2nd highest voice in Berkeley (following "GOT A QWATA?" man), averages 4 hours of sleep per night, has the memory of a goldfish, thinks it's still the 90s, eats ramen noodles excessively, and is really good at face-planting.
"That weirdo is eating a bag of Fritos for breakfast and wearing a plaid jacket over a dress and is six feet tall and watching The Fifth Element... is this 1996 or is that an SBD?"
by Olivia is my pet rabbit May 15, 2008

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