Assturdbation 

The act of stimulating the anus by excreting feces partially out of one's own ass, then allowing the natural pressure of the anus to suck the feces back into one's own rectum. The process is repeated to one's satisfaction.

Dude1: So I've been trying out assturdbation lately.
Dude2: Oh man, I tried that once, it didn't work for me. Too much leakage.
Dude1: Yeah man, you've got to change your diet to avoid all types of fiber.

Assturdbation by gfaisjdfjjwejo July 8, 2016

assturbation 

To pleasure the anal cavity of oneself with the intent of sexual gratification.

I really wanted to go down on her last night, but when I got home she was in the middle of an assturbation session to the new Justin Timberlake video.

assturbation by decamel August 28, 2013

Assturbation 

Masturbation focused on pleasuring the butt, whether it be by massage or insertion.

Wow, this banana is frozen rock solid. I'm gonna have a good assturbation session tonight!

Assturbation by Twiggins Q. Neugebauer June 20, 2011

assturbation 

Masturbation restricted to the ass region. Usually performed by placing dildos, buttplugs, fingers, toothbrushes, or whatever else may be handy into the anal cavity. Lube is optional but highly recommended.

Suzy had never considered assturbation until she overheard Julie talking to Maria about shoving a 9 inch vibrator up her ass while fantasizing about Tom (Suzys dad).

assturbation by mindrape November 16, 2005

amsturbation 

travelling to amsterdam, hoping to get laid, but unfortunate circumstances forcing you to wank instead.

i hope i won't have to do amsturbation this weekend.

amsturbation by chicken adventurous May 9, 2006

assturbating

The act of anal masturbation using either a finger or another tool.

Alyssa was assturbating during English class today.

assturbating by UDadder194 November 25, 2009

Assterbation 

The shameful process of grinding one's "derriere" into the groin area of their dance partner.

Mrs. Rode told us that if she sees any assterbation at the Christmas Dance, she's putting on her coat and leaving.

Assterbation by ChrissyFanB1 December 4, 2009