Skip to main content
1) warez obtained on the day of, or slightly before, its official (legal) release.
2) Information that is not publicly available until it is rapidly disseminated in the online community. Often contains the details of new computer vulnerabilities, allowing exploiters to comprimise computer networks before system administrators have a chance to secure their networks.
Dude, do you have access to any 0-day? I need to get my hands on the new version of Windows.
0-day by Evan B March 14, 2005
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.

0 day warez linkz 

Stupid ploy used by every site that claims to link to pirated software but only leads to 70 year old naked grandmas.
The only 0 day warez linkz site on the net, period!

national 0.5 day 

national 0.5 day where your pictures that are taken in the 0.5 camera shine on december 8th.
“Hey do you know what today is?”
“December 8th”
“No silly, national 0.5 day!”
national 0.5 day by smoochi December 8, 2022
The first day in Polytopia, used to make your first plays
"That vengir made a swordsman on day 0"
Day 0 by Onandonandomnom April 15, 2021
When an attention seeking emo/wemo tries to go so many days without cutting themself, then they fail. (They go back to day 0)

Whenever something bad happens, no matter how pointless, say 'Day 0' to mock the attention seekers, but also as a sign of respect to people who cut because of mental illnesses.
Luke: Damn I just stubbed my toe!
All: DAY 0!
Kristen: I forgot my homework!
All: Day 0!
Sam: I'm on Day 41! I hate that number!
All: Day 0
Day 0 by Day0FTW September 19, 2012

National 0.5 day 

National 0.5 day is a day to be twerked on and take a 0.5
Friend: it’s National 0.5 day let me twerk on you and take a 0.5

national horny day 2.0 

National horny day 2.0 is on April 17. Anyone who missed out yesterday (National Horny Day) or who didn’t fap enough can ask anyone for any sexual content (nudes) and/or actions.
I can’t believe I forgot about national horny day! The most important day... thank god for national horny day 2.0. Time to whip out my nice guy charm and get some pics tonight.
More from Urban Dictionary
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