twincest 

Incestual love or actions between twins, usually identical.
People have said twincest is like masturbating, because it's like having sex with yourself, but it's not. When you masturbate, you have sex with your hand, not another person who looks like you. They are two completely different things.

Girl 1: Omg I totally ship Chandler and Christian!
Girl 2: Uh...but they're twin brothers... That's disgusting.
Girl 1: No it's not! It's twincest!

twincest by bluegreengrass October 10, 2013

Twincest 

Incest between twins, also known as "twincest", is a subclass of sibling incest and includes both heterosexual and homosexual relationships. While in modern Western European culture, such behaviour is considered taboo and is quite rare, incest between twins is a common feature in Indo-European, Indonesian and Oceanian mythology, and there are a few societies in which the prohibition on it is limited or it is partially accepted.

twins having hot make out season what can be more than just kissing. Thats called Twincest.

Twincest by ChocoMonster August 26, 2012

Twincest 

having sexual relations with your twin (fraternal or identical...)

Twincest is on the rise.

Ew.

Twincest by letthegoodtimesroll June 16, 2010

twincest 

when the twin fuck other twin

person 241: "hey bitch i caught you during twincest with candice"
person 69:"NOOOOOOOOOOOO dont tell anyone PLS PLS PLSSSSS"
person amongus: "is that sussy balls twin?"

twincest by amanecore July 28, 2021

Twincest 

the most messed up shit ever

Person 1: “The twins are fucking insane to the point where they'll touch eachother inappropriately in public”

Person 2: “Now that's some twincest shit ion fuck with”

Person 3: “Imagine falling inlove with yourself”

Twincest by cherrygirl69 February 7, 2022

twincest 

when twins are in love and preform sexual activity with eachother, its super sexy, and attracts girls ;).

person 1- "damn, i wish those weasley twins, fred and george, were into twincest."

person 2- "i know right that would be so hot!"

twincest by harrypotter413 July 28, 2011

twincest 

Twins-usually female-going at it.

The twins in the video may have felt bad about their twincest, but I didn't!

twincest by whoarenti December 28, 2011