When you have such bad diarrhea that it feels like your pissing out of your asshole; shitting piss.
Ugh, I was shissing yesterday because of the flu
by LeatherHunterman February 7, 2019
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Form of defecation that resembles urine as much as feces; liquid poo.
Matt just let some shiss rip in the toilet
by Dave April 7, 2003
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To take a piss and a shit at the same time (a combination of shit and piss)
Lisa: Honey, where are you going

Scott: I'm going to take a shiss

Lisa: Don't you mean a shit?

Scott: No a shiss, I'm going to take a piss and a shit, I just think it's easier and quicker to combine the two and say shiss.
by My Name Is Hugh...Mungus August 28, 2009
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To have a case of extreme diarrhea where the fecal matter is completely liquid. Like pissing out of your ass.
Dude don't eat that week old Taco Bell in the fridge or you'll be shissing for days.
by Marzmellow March 18, 2008
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When you go for a dump but only thin light brown water comes out, usually spattering the pan, often resulting in splashback
by Scaredtoleavethehouse June 14, 2009
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A complicated art, when performed correctly 'shissing' exemplifies multi-tasking and unequivocable prowess to the hilt of mankind's uppermost eschalons. Quite literally, 'to shiss' is to excrete simultaneously, which is too say 'pissing whilst shitting...shissing'.

A fundamental quality of military leaders and comedic performers alike, shissing nevertheless assumes the position of social taboo, and is thus confined to confidential conversation and, inevitably, urbandictionary.com
Person 1: Buddy, i have an issue...i need to do a twosie and onesie...at the same time
Person 2: Don't worry, just take a shiss
Person 1: Fo' shissle
by BG.1717 June 28, 2009
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That moment when you need to take a shit and a piss at the same time.
Hold that thought, man! I gotta take a shiss!
by Mu5Hr00m November 9, 2015
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