Top Definition
The act of two people shitting in the same toilet without flushing. (intended as an insult to the bathroom owner)
Hirsch has been an asshole, let's shit stack his toilet.
ayon kay acoustic sean ika-11 ng Abril, 2008

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A shit large enough for two.
I just pooped a shitstack so high, it's coming out of the bowl.
ayon kay daviddeath ika-21 ng Hunyo, 2014

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a pile of shit
Kirby worked up an appetite at the gym so he when he finished he slammed down a shitstack, even eating the curnels of corn. yummmmmm...
ayon kay robbbie is funny ika-29 ng Agosto, 2003

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When many males all stack up on the shitter, each sitting on the lap of the person below them. They spread their legs and the shit falls down into the toilet.
paul, steve, mel and andrew shitstacked it together
ayon kay SteveB ika-23 ng Agosto, 2004

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