Classterbation 

When one gets the sudden urge to bust a nut midway through class. Normally applicable when there is a sexy female in the area.

Student 1: Hey man, did you see that new girl? she was wearing a skirt and i classterbated after i saw her!
Student 2: Dude.... gross.. Classterbation is disturbing.

Classterbation by NutBustah April 13, 2011

classterbation 

Masterbating with the pinky out.

I was at a high brow function and classterbation was in order.... Masterbation with the pinky out!

classterbation by Jujuwee May 7, 2017

Classterbation 

The act of masterbation in class

Isaac enjoys classterbation

Classterbation by Klukluxklandrud May 29, 2018

crassturbation

The act of masturbating at an extremely inappropriate time, with little respect for the feelings of others in the vicinity

John: Bob, we're at a fucking funeral, stop jerking off in the corner!
Bob: Why? Masturbation is perfectly healthy!
John: That's not masturbation, that's crassturbation.
Bob What's that?
John: Look it up on Urban Dictionary.

crassturbation by derpymuffins June 18, 2014

classterbating 

Classterbation: The art of girls crossing their thighs over their pussy and flexing their thigh muscles, which scrapes their jeans over their clit.

Twiggy: Yo, did you see Aubrey classterbating in Chemistry?

Zach: Yeah, she was sweating like a whore in church.

classterbating by Twiggy Lanky Man April 10, 2008

crasterbation 

Jerking off with your own tears. Made popular by the movie "Waiting"

"...like that time you beat off using your own tears as lubricant(crasterbation)?"
"That was only once, and I was drunk."

crasterbation by Jorpy12 June 19, 2006

crasterbation 

Crying and masturbating at the same time.

Distraut after the biznitch dumped me, I hopped on the internet for some crasturbation

crasterbation by Anonymous November 7, 2003