A beautiful term for an extremely Foul smelling fart. The term is made funnier if the fart sounds like quacking duck when expelled from the rectum. Though an SBD can still qualify as a Butt Duck if it is especially foul (emphasis on the word foul/fowl for comic effect). See frequently activated rectal tremble and shit flavored air.
"Fuck Mary, you shit a butt duck! I think you have cancer, something has crawled up your arse and died!"
by keifermail August 8, 2009
alyssa has a butt duck.
by Corinne_creep December 9, 2008
by Scotgirl1027 December 19, 2010
This is a shameful act that only happens in desperation when you are home alone and have completely run out of toilet paper. With your pants around your ankles, squat walking, and your hands spreading the butt cheeks so you don't smear shit everywhere, you walk this way to your roommates bathroom to finish the job.
by Sir Greggles March 30, 2017
Dan and Phil. Two youtubers that that work together to make videos seen by the internet. A popular video is “Hello Internet” by Daniel Howell.
by Gary35Martinel December 26, 2017