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When a twin has sex with their siblings girlfriend/boyfriend while pretending to be them.
1: My brother just tricked my girlfriend into having sex with him by pretending to be me, should I murder him?

2: That's some messed up twinsex right there dude. I would definitely murder him. And John, I'm here for you if you need me.

1: Ok, thanks for the help girl. Now that you mention it, I could use some company tonight, I'm feeling pretty despondent.

1+2 Have sex.

2: That was amazing John.

1: Well, that's because I'm his brother Dave, Johns still crying about me banging his wife.

2: *Murders Dave*
twinsex by J.I.V.L August 12, 2016
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Twintilla 

When two people spend too much time together and start to become the same person.
She's my twintilla, we open doors at the same time from opposite sides.
Twintilla by Hurricane Tortilla September 2, 2016
Related Words

Twink Jesus 

Twink Jesus aka another word for Troye Sivan.
Person 1:"Hey do you know twink Jesus?"
Person 2: "Hell yea! I love Troye Sivan
Twink Jesus by Troyesleftnutt June 17, 2018

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

Twink (Dark Souls) 

A player in dark souls who is given later game items
I gave someone ornsteins armour at level 40 therefore they are a Twink (Dark Souls)

twinks groupchat 

a groupchat full of twinks on stan twitter
“ i love the twinks groupchat
twinks groupchat by okwhore November 21, 2020

twinkums 

shmookems + twink = twinkums

endearing!
used for that special twink in your life!
more effective if said in a high pitched voice and with a sickly sweet smile
“Good morning, Twinkums”
How are you today, Twinkums?”
I love you, Twinkums”
twinkums by tyqwq November 4, 2022