Sincest 

A sinful/smut drawing of to relatives.

Guy 1: “Did you hear about Guy 3’s newest Sincest?”
Guy 2: “Ew yeah, it’s disgusting.”

Sincest by SweetIndeed July 30, 2020

Sinestro 

Sinestro is a red head villain from the green lantern comics and series, he serves as the main villain.

Fear is the enemy of will. Will is what makes you take action; fear is what stops you, and makes you weak... makes your constructs feeble. - Sinestro ( in the live action Green Lantern movie )

Sinestro by crasher 1998 April 8, 2021

Sinfest 

The Bloom County of sex and religion.

Did you read that Sinfest strip? That 'Nique is a hottie in her beatnik beret.

Sinfest by Brian X July 1, 2003

Right Handed Sinestro 

When having sex with somebody from behind, the receiving partner reaches back with their right arm and forcibly attempts to jam their fist up the ass of the giving partner. Named after Thaal Sinestro, the arch nemesis of the Green Lantern, the name is a reference to the fact Sinestro wears his power ring on his left hand so his right hand is free to penetrate people anally, as most supervillains often do with their free hands.

guy 1: I was having sex with this girl last night and I stuck it in her ass without telling her first.

guy 2: hahahaa what did she do?

guy 1: she wasn't happy so she gave me a right handed sinestro to get even.

guy 2: Oh man that sucks!

guy 1: ...I kind of liked it (._.)

Right Handed Sinestro by balooboo May 7, 2011

sancest 

It is about the game undertale were to characters like sans x reader or sans x sans love each other. sancest is the related to the word incest since sans x sans would count as a type of incest. you can find weird videos online on youtube.

hey, dude did you see the new sancest post?

sancest by BigSavageGoat February 26, 2018

Sinestra

a person who is at once beautiful and fearsome. Often used to describe Dominatrixes, particularly Drag-Queen dominatrixes

oh my good, she's beautiful, but scary, she's the full Sinestra

Sinestra by Sinestra October 16, 2015

Siscest 

Incest between sisters. No brothers allowed.

Siscest is between a specific set of sisters. Twins (Identical or Fraternal), full, half, & three-quarter (horizontal or vertical). Sisters that are excluded step, foster, and adoptive.

Our successful siscest relationship has flourished greatly due to the lack of parents.

Notice: siscest sounds like success.

The best incest is siscest, wincest.

Keep up the siscest you two, you'll have a future in Hollywood.

Siscest by a super secret moose January 16, 2017