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1. A "Silent But Deadly" fart. See also "ghost turd" and "air biscuit".

2. The airport code for San Bernardino International Airport.

3. The Douglass Dauntless, an American World War II dive-bomber aircraft.
I can still fly my fume-belching SBD out fo SBD because it's quiet enough.
by Hugh Johnson October 03, 2005
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stop being dumb
“here’s the link to the survey if you feel like filling that bad boy out”
by larry edward March 03, 2019
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A quiet flatulent that makes its presence known by a foul odor; "silent but deadly"
Woo, baby, you blow out another SBD on me or what? Damn!
by Ric Dog June 06, 2003
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"Silent But Deadly"
fart that makes a noise like "pfffft"
usually warm in temperature and eminating an offensive odor
Man, i gotta get the fuck out of this elevator, someone cut an SBD!
by Fartdust December 11, 2003
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A Douglas Dauntless airplane from World War II.

A silent but foul fart. "Silent but deadly."
Lieutenant Walters climbed into his SBD and shouted at Sergeant Powers, who had left an SBD in there.
by The Wog Whomper May 11, 2005
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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
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Smicks (women at Saint Mary’s College) before d*cks (Notre Dame men)
“Hey i’m gonna have to cancel plans, Johnny asked me to go over to ND”

“Come on girl, SBD”
by wonkeywalrus101 October 14, 2018
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