0-day 

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

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!

0 day warez linkz by Jeffery Kark July 7, 2003

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

Day 0 

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

Day 0 

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 0.5 day by National 0.5 day October 3, 2023

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.

national horny day 2.0 by niceguyxx69xx April 16, 2020