Sexclusion

When two out of three people in a group are in a flirtatous mode and obviously want to bang each other while completely exluding the third wheel.

While Bettie and Harold fondly caressed each other, Greta was in the corner feeling pangs of sexclusion.

Sexclusion by Stephanie Anne Brock November 10, 2008

Sexclusion

When two out of three people in a group are in a flirtatous mode and obviously want to bang each other while completely exluding the third wheel.

While Bettie and Harold fondly caressed each other, Greta was in the corner feeling pangs of sexclusion.

Sexclusion by Stephanie Anne Brock November 10, 2008

sexclusion principle 

When determining where to place electrons in atoms, three rules are generally used: the Pauli exclusion principle, the Aufbau principle, and Hund's rule. The Pauli exclusion principle, from which the pun is derived, states that no two electrons (or indeed any fermion) can occupy the same atomic state. Therefore, any electron orbital is limited to two electrons: one with a spin, and the other with a − spin. The Aufbau principle states that lower energy orbitals are occupied previous to high energy orbitals. Hund's rule states that electrons will try to fill orbitals individually, and only pair up when every orbital has a lone electron in it.

In the comic, electrons are being equated to people, and rooms (or couches) are equated to orbitals. The reverse of Hund's rule is then followed: people will try to pair up in a room first, and only when all the couples have done so will rooms be allocated to single people. The Pauli exclusion principle here means that only two people can occupy a room at a time (should those people be romantically involved). The Aufbau principle therefore means that more restful rooms are filled previous to less restful rooms.

The title text jokes about drunken party-goers, who ignore the Pauli principle perhaps out of inebriation. They then end up partying and sleeping together with many people in the living room, leaving the roommate stuck in the third desirable location, the hall lounge.

See xkcd.com/658/ for visual diagram of Pauli's Sexclusion Principle

sexclusion principle by Bad C dev September 20, 2021

Sexplosion 

When the male of a species that uses sex for pleasure has gone without intercourse for such a lengthy time that the resultant discharge is akin to a turbo-powered firehose hooked to a vat of mayonnaise.

After Bobo the Wonder Chimp had been isolated for 8 years, his first sexual encounter resulted in a sexplosion which rocketed the unfortunate female chimp a distance of 200 yards directly into a meat grinder. The silver lining is, the resultant burgers were delicious.

Sexplosion by Dragonwolf November 13, 2018

sexcisions

Decisions, of a sexual nature. Can be negative or positive.

"Tina, put down the jäger and make good sexcisions tonight, ok?"

sexcisions by RitaManeata August 5, 2015

Exclusionist 

A member of the LGBT community who believes the acronym is LGBT+ (for enban sexualities).

Commonly included as exclusionists are Long Sword Lesbians, Gravity Knife Gays, Trident/Trench Knife Trans, Battle Axe Bisexual, and Nunchuck Nonbinary.

Exclusionist beliefs include: Pan = bi, hesbians/theysbians are fake, shegays/theygays are fake, anti non-trad neopronouns, asexuality isn't included in LGBT, etc

Tracey: Hey, did you hear that there's a new xenogender?
Travis: No, I'm an exclusionist, I don't believe in xenogenders.

Exclusionist by tychobrahesnose April 20, 2021

exclusion zone

When you are rating how hot a woman (or man) is, but you have to rate them while ignoring a fundamental flaw in their looks, personality or grooming.

The chick I met in Paris was a Perfect 10 - if I apply an exclusion zone on her armpits.
The guy was goofy looking but, if I put his cheesy mustache in an exclusion zone, he was kind of hot.

exclusion zone by ABQ Thesaurus Rex August 30, 2016