ZERO DAY was the code-word that two students used to describe the assault they planned for over a year, and which they finally executed on May 1st, 2001.

On that warm and beautiful spring day, Andre Kriegman and Calvin Gabriel, two students of Iroquois High School, walked onto to their campus with three semiautomatic weapons, a shotgun, a revolver, at least twenty explosive devices and several knives.

ZERO DAY, the movie, brings us into the world of best friends Andre and Calvin.

Self-named the "Army of Two" they used video cameras to record everything relevant to their final "mission." Their video diaries provide a window into their chillingly ordinary lives, and as we get to know them we become seduced by their intelligence, their humor, their directness, the inward and outward expressions of their adolescence, and their terrible single-mindedness.
Andre: Zero Day movie bro.. youtube.com/watch?v=pgRDWjafLm4
Calvin: O_O wow, we're brutal.
by Gregz0rzz December 12, 2006
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A cyber attack that is done through a vulnerability in a software application that the developer of the software is unaware of and is first discovered by the hacker. The term is used to mean that the software developer had zero days to work on a patch to fix an exploit before the exploit was used. One of the most common applications to have a zero day exploit is a web browser.
John: All the data on my computer was destroyed by a virus.

Bill: Yeah you need to be very careful when you download porn.

John: No, I heard it was done through a zero day exploit on Internet Explorer.

Bill: Oh I see. But why are you using Internet Exploder? Everybody knows that's a piece of shit browser.

John: Don't know, I never will again.
by dead parrot September 19, 2010
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Stands for a photo developed and sold on the same day it was taken. (The term is commonly used by race day photographers. ZDP is commonly used but not limited to the subjects of running, biking, swimming, football, basketball, tennis, golf, race car, or fishing photography.)
Can be used like, "Hey, do you have any zero day photos of this event? I want to get mine today!" or "Do you know where I can get some zero day photos of this event? I want some photos that were taken of me from this race but I want them now!" Zero day photo is sometimes used in the form of an acronym like, "Hey, you have any ZDP's of this event?"
by John K. Photographer January 30, 2008
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As "Patient Zero" refers to the first known infected case in a zombie plague, Patient Zero Day is the celebration of the coming of the first ever zombie- that zombie is Jesus Christ. (Patient Zero Day is Easter).
"Happy Patient Zero Day! Did the bunny give you chocolate eggs?"
by seepyseedy April 1, 2013
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The day where i get to bully my friend zero
“National bully zero day”

I hate you zero!”
by Utmom May 4, 2021
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The day when you wake up and are 100% free from any bondages of a boss, because you are now getting paid without having to work—you have graduated from a tired-and-broke entrepreneur (who used to slave for sixty to eighty hours a week for yourself to avoid working forty hours a week for someone else) to a passivepreneur.
From Day Zero, you no longer need an alarm clock as you could sleep through until you feel like waking up to have your breakfast at any time of the day.
by Fasters January 28, 2023
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In PE when you get a zero out of five for participation and it’s not negotiable.
*commits a non negotiable (another definition search it up)
PE teacher: zero for the day take a seat dumbass.
by Rheumatism December 18, 2019
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