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.
od uživatele acoustic sean 11. Duben 2008
3 more definitions
A shit large enough for two.
I just pooped a shitstack so high, it's coming out of the bowl.
od uživatele daviddeath 21. Červen 2014
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...
od uživatele robbbie is funny 29. Srpen 2003
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
od uživatele SteveB 23. Srpen 2004