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Dullers are grey humanoids in the Backrooms who can noclip through walls.
Dullers noclip through walls as a hunting tactic.
Duller by MaybeARealWord January 12, 2022

duller than a dildo 

A simile used to describe the sharpness of a knife or cutting tool by comparing it to the sharpness of a sex toy.
Did you sharpen this knife with the rubber? It's duller than a dildo!
duller than a dildo by 15thtexas1 September 11, 2023

adam duller 

a person who enjoys roleplaying dungeons & Dragons games.
that dude is a real adam duller; get your head out of your adam duller
adam duller by hugh jelbow May 26, 2009
Borned as a true leader and also the best in the world. A true alpha.
Do you know Duler?
Who doesn't?
Duler by Wolf8 October 12, 2019

teeth dullers

Before the march a day's ration of teeth dullers (hardtack) was distributed to each soldier.
teeth dullers by talk2me-JCH2 July 25, 2022

Dulled Out 

To be extremely bored.
Wow, there's nothing to do. I'm so dulled out.
Dulled Out by fuckingay May 6, 2007
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
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