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2.
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
 
1.
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
 
3.
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
 
4.
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
 
5.
When you are walking your dog and he attempts to lift his leg to take a piss, then re-thinks he has to shit. Resulting in a dog shitting with his one leg up. Very comical!
Good Ol' Taz took a shiss on that rock out of piss/shit confusion.
by Tiptop77 November 25, 2012
 
6.
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
 
7.
The word used for the immediate need to take a simuntaneous shit and piss, or shitpiss. Translated is Shiss.
After a huge lunch, I had to rush home to perform a Shiss.
by The masterful December 27, 2012