twinsest 

like insest. but with twins

i always thought you two twins were too close. IT'S TWINSEST

twinsest by Lexxx March 23, 2007

Twinsest 

When two twins decide to have intercourse together. It also complied with triplets, quadruplets, etc.

Person 1: Do you see those red neck Twins?
Person 2: Oh yeah they Twinsest.

Twinsest by cici69 October 25, 2018

Twincest 

When someone is sexually intimate, or develops an incestuous relationship, with his or her own twin.

1. "The McPoyles from 'It's Always Sunny in Philadelphia' are definitely guilty of twincest."

2. Person A: "Dude, did you see those two guys going at it? They looked exactly alike!"
Person B: "Yeah, man, didn't you know? They're in a twincestuous relationship."

Twincest by NecroManzie September 28, 2009

twincest 

When twins are in lust/love with eachother.

twincest by Anonymous September 14, 2003

Twincest 

When Twins are in love with one another and/ or like to perform sexuall activities together.

Benji and Joel are in alot of Twincest fics.

Twincest by Rhiannon December 8, 2003

TWINCEST 

Twincest
Gives new meaning to fo fuck yourself.

TWINCEST example: Hikaru Hitachiin and Kaoru Hitachiin
(if you dont know who they are, LOOK THEM UP)

TWINCEST by ASIAN >.< Wu-Dawgg May 7, 2010

Twincest 

Incest between any set of multiple birth siblings. Twincest can occur between twins, triplets, octuplets, etc. Twincest may also occur across gender lines (sisters, brothers, or both). Twincest can be any level of sexual intimacy.

The Visconti triplets practice twincest in homosexual pornography.

Twincest by T-Winner July 10, 2009