shasterbated 

(verb) an African tribal ritual mimicked in many welsh farmers in which the farmer gets a sheep and proceeds to insert his large spoonful of animal feed in order to keep his flock well fed and healthy

The welsh shepherd shasterbated the sheep with his gargantuan spoon full of feed

shasterbated by Michaelinyjon Jones January 10, 2008

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

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

Shatterbate 

(v) The Act of Masturbating while taking a shit

"Shit, I really had to pinch one out when I was at Six Flags. I just decided to shatterbate in the bathroom"

Shatterbate by Shrek'sBrotherinlaw November 19, 2014

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

shasturbate 

The act of shitting and masturbating simultaneously

Adam went to the bathroom to shasturbate. Won't see him for awhile

shasturbate by Gumbooo April 29, 2014

Shasturbate 

The act of masturbating in the shower

Hey i have to shower later tonight, so don't Shasturbate before i do!

Shasturbate by The Kali Kid February 17, 2009