1 definition by Mark Trageser
A fart made while sitting in a chair. A chair has four legs. The person has two arms and two legs- that's eight legs- thus the spider reference. With time the term has been misused so often, it has now come to mean any fart.
( Person sitting next to you lifts one leg and farts ). I have to go, that Barking Spider just put me off my lunch.
by Mark Trageser March 8, 2008