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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.
"John is shashawing like crazy." "Hey guys (Silence) Shashaw, shashaw!!!"
by Gargolas March 10, 2009
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