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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
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
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
Telling a Haitian Happy birthday; zoe day
Happy z day Miguel ❤️
Z DAY by Queenxhaitian June 11, 2021
Z day it's throughout September 24-25 it's the day Shahzy made it celebrating zday will definitely make you pretty and pull everyone go now
Chad: "Hey Brandon you heard of Z day"
Brandon: "No what's that"

Chad: "You joking Z day is like the best day ever just thank Shahzy for helping you make it and being able to see queen Raven"
Brandon: "You're right I love our Queen Raven I will celebrate Z day"

*Brandon and Chad celebrate Z day*
Rachel: "Hey Brandon and Chad you both are hot and you both celebrate Z day run that train by me" Chad: "Okay!"
Z day by Cocoshawn September 24, 2022
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
More from Urban Dictionary
The striver is an interesting phenomenon that is seen across college campuses. In essence, the striver is an over-achiever who comes from a working or middle class family. He may be an immigrant. He may have been a slacker in HS who was "born again" into an academic wunderkind. Or he may just be an over-achiever who is keeping at it.

The striver is willing to sacrifice his social life at the expense of Phi Beta Kappa and Summa Cum Laude. The striver is the guy who stays at the library long after you are gone. The striver is the guy who takes 30 credits/semester and considers anything below an A/4.0 failure. The striver doesn't work on campus, he is too busy finding ways to pad his resume instead of working retail or workstudy. The striver lets his grades pay his education by applying to ten scholarships a year.

The striver is a future Soros/Fullbright/Rhodes/Gates/Marshall/etc. fellow. The striver lives to study. For the striver, their fun comes from the rewards they expect to receive in return for their diligence. Be it Law School, B-School, academia, or politics. The striver seeks to find the American Dream through academic success.
Anthony was a striver. He transfered from a TTT to an IVY and graduated in 2 years. He studied his ass off and went to Penn Law. He got a Biglaw offer. But lost it all because of an unmoderated mesasgeboard.

Successful strivers:
- Barack Obama
- Harold Koh
Striver by URM Striver January 3, 2009
Word of the Day on August 15, 2026
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