When somebody is being a mongoloided cunt, they can be referred to as having “shit in their ass” because mongoloids commonly forget to wipe their asses after they shit so you are basically calling them retarded.
Riley: you should take glacial augment on Darius because the slow helps him avoid being kited.
Maute: shut up Riley you have shit in your ass
by IMadeAnExplanationForAWord January 31, 2018
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The flow of human excrament as it flows out your anal sphyncter down your leg and out your pant leg.
Damn, man after a hard day at work I love to come home and shit my ass...

or...

GET THE FUCK OUTTA THE WAY IM GONNA SHIT MY ASS ALL OVER!
by James February 24, 2004
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