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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.
by ChocoMonster August 25, 2012
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30
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!"
by harrypotter413 July 27, 2011
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31
having sexual relations with your twin (fraternal or identical...)
Twincest is on the rise.

Ew.
by letthegoodtimesroll June 15, 2010
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32
Twins-usually female-going at it.
The twins in the video may have felt bad about their twincest, but I didn't!
by whoarenti December 25, 2011
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33
To date, "hook up" or flirt with someone who closely resembles a friend to avoid messing up the friendship.
Girl 1: Dude, that kid totally looked like your best guyfriend!

Girl 2: I know! I had twincest with him.
by IlyBearzxD January 01, 2011
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34
Something that is so wrong in real life but so right in anime.
Giving a whole new meaning to "go fuck yourself".
If you ask me, the sexiest twincest is Hitachiincest (Hikaru x Kaoru Hitachiin) from Ouran Highschool Host Club. But my friend hates it. But then again she hates yaoi sooooooooo...
by 730cute September 17, 2014
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35
A word pertaining to the pairing of Fred and George Weasley, twin boys from the Harry Potter Series.
I absolutely love Twincest, even though James Phelps suggests it's wrong
by PunkxxRoyale December 28, 2009
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