Shitsturbate 

To masturbate oneself while taking a shit. Simultaneous masturbation and defecation. The ultimate dual release.

After years of marriage, Carl's wife finally figured out her husband takes an excessively long time in the bathroom because he loves to Shitsturbate.

Shitsturbate by Eaton Holgoode April 28, 2016

shasturbate 

The act of masturbating while defecating.

I was in such a rush this morning that I was forced to shasturbate,.

shasturbate by vink pink February 10, 2005

Shatsturbation 

When you masturbate while shitting, so both explode at the same time.

After last nights shatsturbation, I thought I could die happy. It was pure bliss.

Shatsturbation by prosperoust February 4, 2009

shiturbate 

The act of masturbating while taking a shit.

Thomas missed the meeting because he decided to shiturbate.

shiturbate by Fuzzy Buttons December 15, 2013

shasterbate 

shitting while masterbating

person number 1: "oh wow Justin the football player, takes a long time in the bathroom"
person number 2: "hes probably masturbating while he shits"
person number 1: "haha, Justin shasterbates"
person number 2: "hahahaha thats clever. shasterbate!"

shasterbate by shexcelent December 1, 2009

shaturbate 

To shit and masturbate at the same time

I was sitting on the toilet, and I decided to shaturbate to this picture of Jenny

shaturbate by Poloshirts64 May 7, 2014

shisturbate

To masturbate while taking a massive shit.

Last night, I became aroused while taking a shit, but since I was so pressed for time, I decided to shisturbate.

shisturbate by THE SHLEEPER August 7, 2009