z-day 

Noun (zee day): A term probably coined by Max Brooks which refers to the war between zombies and mankind. Derived from the word D-Day, which is a British term used to refer to a variable day on which a combat attack or operation is initiated. Z-Day is marked by a sudden attack on mankind by zombies, which will lead to a widespread zombie outbreak. There are a number of zombie survivalist groups worldwide (largely in the US, UK, and Canada), that are already planning what to do when this day comes.

Z-Day will catch mankind completely off guard, and the lack of preparation will lead to countless casualties.

z-day by Edward Stevens August 26, 2006

Z-Day 

The day when zombies are said to rise from the grave due to radiation,a virus ,or something else, and generally cause chaos .While most people don't beleive that this will ever happen , There are millions of web pages soley dedicated to helping people be ready for z-day.
Some people even have a z-day survival plan and treat it as seriosly as you would treat a survival plan for if there was nuclear war.

Matt : Hey Joe , do you have a plan for Z-Day ?

Joe : what's that ?

Matt : It's when the dead are gonna rise from the graves and become zombies , and there will be chaos and everyone will go crazy

Joe : okay ...I think you've allready gone crazy

Z-Day by Victoria Violet October 31, 2006

Z-day 

any day that one takes to avoid daily responsibilities(usually a day of school)by faking some kind of illness.

"Man, i heard she's taken like 20 Z-days already this year"

Z-day by T-lzr April 6, 2009

Z Day 

The morning when zombies will rise from the dead and feast on the flesh of the living...

Kirk: Hear ye, hear ye, Z day appoaches... Repent sinners...

Sinners: Eh, eh, rick my barrs...

Kirk: Well, fuck off you salad tossers, me and my party are all meeting at Jordans...

Z Day by Buphstuph17x November 3, 2005

Z Day 

This term was used by the British Expeditonary Force in preparing for the Battle of the Somme in 1916. It culminated previous days of artillery bombardment called U,V,W,X,Y days. The actual time of attack was called Zero-Hour. Compare these with D-Day and H-Hour used by American troops late in that conflict, terms which became more widespread during WWII.

"Z Day" is found in numerous historical accounts from the time. For instance, from Guy Chapman's wartime memoir, "A Passionate Prodigality": "We were waiting for Z day. ... Once more Z day was postponed."

Z Day by New Nutmegger August 22, 2011

z day 

Calling off work every Monday with a stupid excuse

Awe dude!!! i'm taking a z day today cuz i got explosive diarrhea

you ok? what happened?

My mama made some cookies last night and it tore up ma stomach boiii

z day by ezdoesit2me October 21, 2008

z day 

Calling off work every Monday with a stupid excuse

Awe dude!!! i'm taking a z day today cuz i got explosive diarrhea

you ok? what happened?

My mama made some cookies last night and it tore up ma stomach boiii

z day by ezdoesit2me November 6, 2008