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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
Related Words

Twinsexual 

When one is attracted to twins, 2 people who look exactly alike but different personalities, and is only attracted to these rare human clones.
The other day, Rob told me how he was twinsexual instead of being bi or straight. What a morman!
Twinsexual by Sarah January 12, 2004

Twinksexual 

Someone extremely attracted to twinks on a daily basis, surely named Célia.
“Oh my god, did Célia crush on another Twink at the party? She’s 100% a twinksexual.”
Twinksexual by syogen August 1, 2022
More from Urban Dictionary

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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