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
Top Definition
Form of defecation that resembles urine as much as feces; liquid poo.
Matt just let some shiss rip in the toilet
by Dave April 06, 2003
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 fanboys of anything suck dick August 28, 2009
When you go for a dump but only thin light brown water comes out, usually spattering the pan, often resulting in splashback
"I just shissed all over the place"
by Scaredtoleavethehouse June 14, 2009
To shit and piss, all in one sitting.
1) Dude! Pull over! I gotta take a Shiss!

2) God damn it! I think Gary just shissed himself!
by The shissmaster October 20, 2009
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 January 12, 2016
When your in a hurry(whether it be to get back to video games, dinner, or bed) and you push to hard while peeing, coincidentally shitting your pants.
I heard David in the bathroom at lunch. He was pushing so hard peeing I thought he was going to shiss!
by David smallwood February 04, 2015
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