Shitsturbating 

When you're jerking off on the toilet before a shower but flush it before you get in the shower so your family thinks you were shitting

Yesterday I was shitsturbating but I forgot to flush... Now my family totally knows I was wacking it.

Shitsturbating by Shitsturbator69 December 10, 2018

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

Shiturbating 

When masturbating while taking a dump.

Sorry for the mess in the bathroom, I was shiturbating.

Shiturbating by thesavagebreast June 19, 2014

shmasturbating 

The act of masturbating while taking a shit.

Johnny just came back from shmasturbating n the bathroom.

shmasturbating by Matthew Kessler October 22, 2013

Shatsturbating 

The act of pooping, whilst, simultaneously, masturbating. This act is best accomplished on a toilet, or toilet-esque surface.

"I ate a lot of beans, and then I shatsturbated!"

Larry: "Wow, Turner, what's that smell coming from the bathroom? It smells of quando and poopy."
Turner: "Don't blame a brothah for shatsturbating. It's natchrill."

Shatsturbating by Jason Brown Bear January 13, 2008

shitterbating 

masterbating whilst taking a shit.

Wow, Mr. Tamositis has been in there a while, I bet he's shitterbating again . . .

shitterbating by henrydinhofer October 18, 2010

shassturbating 

The act of vigorously inserting your thumb into and out of your rectum while masturbating in the shower.

Chris blew his load everywhere when he was shassturbating this morning.

shassturbating by Mytinylittlehand May 7, 2017