Insestubate

Insestubate to jerk off and your mom walks in and you surprise cum on her.

"I just insestubated on my mom last night"

Insestubate by The E Man11231 June 20, 2019

Investurbate 

When you can't determine whether something is hot or not, so you decide to put it to the masturbatory test.

I'm 50% certain this HomeGoods ad is heating me up, but I'm not sure. Time to investurbate.

Yahoo Answers couldn't tell me whether or not I'm sexually attracted to Ansel Adams' photographs, so I had to do some ground-level investurbation. I'm not. We're good.

Investurbate by asthmaticdan October 20, 2015

investibate 

The act of investigating a pornography site in order to determine it's quality (usually through masturbation).

"Give me the URL of that site, I'll investibate it later."

investibate by cantstopwontstoppp April 16, 2009

Incesturbate 

To masturbate your identical twin.

"What did you guys do last night?"
"My twin brother and I attempted to incesturbate for the first time"

Incesturbate by Garooshnar December 20, 2016

Incesturbated 

When you fuck the other sex version of yourself.

Turns out the girl i fucked, was the female version of me from a parallel universe.
My face when i just incesturbated .

Incesturbated by Cerez-X March 10, 2018