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

Catsturbation 

The act of masturbating only to open one's eyes to the judgmental stare of one's cat

Fluffy walked in on me again...So I guess catsturbation is my thing now. I really need to get a girlfriend.

Catsturbation by hightowers April 17, 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

massturbation 

mass masturbation. pronounced: mass-ter-bay'-shun. dry orgy. massturbation can refer to the act of stimulating one's own sexual organs in the presence of other persons (seven or more) who are performing the same act. it can also refer to an event involving such acts. massturbation is gender-blind. verb: massturbate. someone who massturbates: massturbator. someone who is taken to a massturbation against his/her will or someone who is new to massturbation: massturbatee.

Susie: "Where were you last night?"
Frank: "Attending the massturbation at the stadium."

massturbation by mecovili October 20, 2006

classturbation 

To be in a class so boring that you take your non-dominant ( or dominant) hand and reach into your pants pocket and proceed to stimulate your genitals.

Matt: Dude that class was so boring, I just classturbated the whole time.

Nadsack: Me too. Classturbation helps with my tourettes.

classturbation by cockjuggling thundercunt March 21, 2009

Critical Massturbation 

(n)The point at which one's ejaculation becomes explosive.

"Man, last night I jacked it for like six hours before I hit critical massturbation."

Critical Massturbation by MisterCell. April 14, 2013

Classturbation 

When you fantasize about classmates while fondling yourself.

"I hear Jason is in to Classturbation."

Classturbation by Cgtheberzerker September 9, 2015