the act of using surrounding noises to strategically defecate in a public restroom. taken from Tim Robbins' escape from the fictitious "Shawshank Prison," wherein he bludgeones a large sewage pipe with a rock, striking the pipe only when the thunder from a lightning bolt is loud enough to mask the noise of his stone as it strikes metal.
man, i had to crap so bad! but i knew with only one other guy in the bathroom, shawshank shitting just wouldn't be an option.
The action of when a coworker goes into the public bathroom at work and starts blasting out wet gross turds, while his coworkers are in the bathroom washing their hands. While blasting it out, the pooper continues to converse with the others. Also could be used to describe something explosive, or to blast.
When one is pooping in a public bathroom, embarassed by ass noises, one waits for others to make noise to allow for loud ass explosions. Similar to Tim Robbins in "Shawshank Redemption" waiting for the thunder so his banging on the pipe would go unheard.