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

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

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

Shatsterbate

1. Masturbating while sitting on the toilet taking a deuce.

2. Masturbating while thinking of William Shatner

1. My room doesn't have a lock on the door so I had to go to the bathroom to shatsterbate
2. William Shatner is the only person on earth who shatsterbates

Shatsterbate by gcrack September 19, 2011

Shitsterbation 

Act of shitting in your hand and beating your dick with your shit

Jack took a massive shit and used his shit to shitsterbation

Shitsterbation by Pussytoass June 20, 2021