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

Shitsturbate 

The act of reaching your hand into your rectum and covering it with shit. Then using the shit covered hand to masturbate. The shit will act as a lubricant

Joe: I cummed to the roof whe I finally decided to Shitsturbate!

Paul: I told you!

Joe: Yeah, poop is good lube.

Shitsturbate by Topazoo November 29, 2009

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

Shitsturbation 

A simultaneous performance of shitting and masturbating, often done in public restrooms.

Kayla: Wow, I heard some really weird noises when I was using the restroom. Sounded like someone was really enjoying their dump...
Michael: They were probably undergoing Shitsturbation. It's like a self-performed blumpkin with your hands.

Shitsturbation by gofgirl983 December 17, 2011

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

shitsterbate 

to masturbate on the toilet while taking a shit

there are some good porn mags in the bathroom I couldn't resist getting my shitsterbate on just now.

shitsterbate by james___ March 20, 2008