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Relating to a security vulnerability or exploit that has not been released or known about by the general public. Often begged for on lists such as "Full-Disclosure" by kiddies.
Sometimes lamers will call it Ohday (OH-day)
1. Full-Disclosure Where teh 0day

2. Damn I must've got pwned by some 0day.
0day by h4x0r June 22, 2004
Related Words
Generally used when talking about cracked software, cracked and released the same day as the software was legally available.
That copy of DOOM I just got off of Funet is 0day man!
0day by SomeRandomWhiteGuy May 24, 2003
Used in IRC or other chat (in the negative) as a sarcastic comment to something already said or "old news."
<person_1> X just happened, check out website
<other people> Very interesting, person_1!

... 3 hours later ...

<person_2> OH EM GEE X JUST HAPPENED website
<other people/person_1> That's so not 0day.
0day by rmb September 4, 2006
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!