Skip to main content
Urban Dictionary Merch
Your favorite words on things you can wear, drink from, read, or give to a friend.
The Urban Dictionary Store sells gifts you’ll have to explain.

Negative Reality Inversion 

A Negative Reality Inversion (NRI) a term originating from the series "The Young Ones" and is actually technobabble.

A Reality Inversion would be the symmetrical inversion of reality. Making it negative would actually cancel it out, leaving you with reality.
NEIL: Anybody watching that must've thought it was a negative reality inversion.

*A man and woman are making out in the shadows
WOMAN: Cor, that looked just like a negative reality inversion, didn't it?
MAN: Yes, it did, a bit.

*They turn their attention back to each other

cranio-rectal intrusion 

A malady common to carbon-based life forms, cranio-rectal intrusion is also known as having your "head up your ass." As the size of any bureaucracy or institution grows, an exponential increase in the number of cases of "cranio-rectal intrusion" will also occur.
With no repercussions ever being suffered for not following the very laws it institutes, the U.S. Congress continues to prove that the people of the U.S. are suffering from a level of apathy that can only be achieved by prolonged cranio-rectal intrusion.
cranio-rectal intrusion by BiggerD October 14, 2010

arctic intrusion 

A sexual act, in which an ice cube is inserted into one's anus at the point of climax.
I had to kick her to the curb. She kept begging for an arctic intrusion and it was just too weird.

ANAL-CRANIAL INVERSION SYNDROME  

A chronic condition by which the physical connections between the buttocks and head are reversed, causing fecal material to spew from the mouth. Conventional treatments include wiring the jaws shut or the prompt use of a gag ball.

ACIS is more harmful to those coming in contact with the ACIS person than the ACIS person him/herself. Even casual contact results in looks of disbelief, screaming and the uncontrolable urge to place one's hands over one's ears and yell "Make it stop". Family and friends living with an ACIS patient are advised to wear ear plugs, or in more extreme cases, to drive shiskabob spears through their ears.

Not to be confused with having Head-Up-Assitisis or Asshatoses.
President Bush displayed symptoms of Anal-Cranial Inversion Syndrome at his last interview when he spoke about his legacy.

cranial rectal inversion 

The act of having your head up your ass.
"Are you really that stupid? You must be suffering from a cranial rectal inversion. What a dumb-ass."

Heavy Intentions 

An award winning hard rock/ metal band from New England that consists of three members Aidan Joyce (bass and vocals) Damien Sargent (drums) Nolan Harold (guitar)
Heavy Intentions is the best rock band in the world.
Heavy Intentions by Metalguy169 July 24, 2019
More from Urban Dictionary
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
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026

Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
Slop Grenade by Joe Squid September 28, 2026
Word of the Day on September 29, 2026
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
floxi by Dr. Geek May 13, 2009
Word of the Day on September 28, 2026
Load more