Twinception

Fraternal twins (one male and one female) who have fraternal twins themselves (one male and one female) who have fraternal twins themselves (one male and one female)... and so on

"Hey John, I was talking to your sister, and from your family tree, it looks like you guys had a pretty bad case of twinception, like 6 generations in-bred"
"That's no big deal, my twins might be in high school and having sex on a regular basis, and one of them have double-down syndrome, but it isn't any different than my household growing up... Like father and mother, like son and daughter i guess."

by 17link7 December 30, 2014

twincestual

Twin + incestual

That is fucking horridly twincestual.

Do not go on TwinTok, there’s a lot of twincestual content.

by LingDanc803 October 28, 2023

Twinchester

Having went home with twins after a night of heavy drinking at a classic English pub

Bill-"How'd you do last night?"
Chris-"Total Twinchester Dude!"

by Marky Mark Fa Sho May 28, 2008

Tincest

When you accidentally swipe right on a family member on Tinder.

"I accidentally swiped right on my sister..." "That's tincest, my man."

by Iancohen May 8, 2015

Trincest

Triplets having sex.

Or any other 3 individuals from the same multiple birth, I'm not picky. It can be the same person twice for all I care.

I liked ElsaxAnna, I loved uptight Elsa/free Elsa, I adore the 3 together in trincest!

by MockTurtle October 10, 2016

Twinkcest

A term describing a romantic or sexual relationship or interaction between two twinks. It most commonly refers to sub x sub dynamics, though rarer variations like dom x sub or dom x dom are also possible.

" Those two twinks at the party were totally into each other—it was hinting at some serious twinkcest vibes ! ! "

by aggudesu October 4, 2024

Twinkcest

A sexual relationship involving two submissive males (twinks/femboy) that are related by blood or by law. Mostly describing sub x sub dynamics, but different variations like sub x dom and dom x dom can work if they both present as submissive.

"Did you see those two twinks kissing on twitter? I heard they are related, definitely some twinkcest going on."

by ThefemMAN October 5, 2024