shitasfaction 

The pleasure/satisfaction one gets from having a good bowel movement.

I was constipated for days and then got such good shitasfaction when I finally pooped!

shitasfaction by anniebanani July 28, 2009

shatisfaction 

That feeling of accomplishment and relief following a really big dump.

"On the Pleasure Pyramid, shatisfaction falls somewhere between getting a really sticky booger off your finger, and an orgasm."

shatisfaction by yukoncornelius April 9, 2003

shittifaction 

The satisfaction of taking a shit

I just left the bathroom in complete shittifaction

shittifaction by Too shit for you October 5, 2016

Shatisfaction 

The immense existential feeling of completeness after sharting out the fattest log this side of Canada.

Mate, I was holding in a shit for two hours and just let it rip-the shatisfaction man

Shatisfaction by Terrence Gabalion March 19, 2021