fart dust is microscopic and/or visible bits of feces expelled from the rectum. Feces accumulates on the sphincter after wiping the buttocks because of the wrinkles of the sphincter. Feces dries and when a person farts/expells gas the sphincter opens slightly and the wrinkles open and allow the dried feces to fall and be blown out. Dr. Chuck of The Virginia Fecal Institute performed many experiments to prove the existence of fart dust despite many disbelievers but proved without a shadow of a doubt that it in fact existed. With the help of a "volunteer", he had the test subject fart on a clean sheet of printer paper and the fart dust materialized. Fart dust does not occur with peoples who use baby wipes or bidets for cleansing their buttocks after bathroom use.
by Charles Golay October 17, 2008
The seat fabric had accumulated nearly visable fart dust from its experience since being manufactured in 1951.
by Ashton Lee September 22, 2003
by gyrussfanx May 08, 2007
The Dust that flies when you slap a couch cushion, padded chair, or any other soft surface where people sit.
by pghpanthers2 September 15, 2008
by showty22 April 10, 2003
A really dry flatulence which upon exiting the anus emits dust which then can be seen on the inner lining of the undergarment as a powder like substance which falls away upon removal of said undergarment.
by Auron117 September 11, 2015