insester 

An incestual sister.

I saw your insester yesterday she totally wants you.

insester by Meat senpai August 20, 2016

Insester 

Someone that has sex with their siblings.

Omg she's an insester she just did her brother.

Insester by Rothmo22 January 2, 2017

incesterbation 

When you have sex with your clone, your doppelganger, or a version of you from a parallel universe.

If you clone yourself and then have sex with the clone, it is neither incest nor masturbation, but both: incesterbation.

incesterbation by Anon Imus November 16, 2006

investerection

The sexual arousal caused by a stock portfolio that is making positive returns.

This bull market is giving everyone on Wall Street an investerection.

investerection by Germankid September 3, 2016

Insuster 

Tom Kenny's mix of the word Imposter, and sus!

Yooo hes acting a little like an insuster!

Insuster by Jaden Harrison Taylor July 4, 2021

Incesterbation 

The act of having sex with your clone; a mix of masturbation and incest.

Spotti cloned herself and I caught her incesterbating, and it was awesome. It was some pretty hot incesterbation.

Incesterbation by Taliaa July 16, 2007

Insisters 

Sisters that commit incest.

"Did you see Emma and Katie getting it on last night?"
"Yeah... aren't they sisters?"
"Yeah more like insisters."

Insisters by soupy1 November 6, 2015