When you masturbate while shitting, so both explode at the same time.
After last nights shatsturbation, I thought I could die happy. It was pure bliss.
by prosperoust February 4, 2009
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The act of pooping, whilst, simultaneously, masturbating. This act is best accomplished on a toilet, or toilet-esque surface.
"I ate a lot of beans, and then I shatsturbated!"

Larry: "Wow, Turner, what's that smell coming from the bathroom? It smells of quando and poopy."
Turner: "Don't blame a brothah for shatsturbating. It's natchrill."
by Jason Brown Bear January 6, 2008
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