When a countdown is scheduled to end. Alternatively, a deadline.
From Elton John's "Rocket Man"

She packed my bags last night pre-flight
Zero Hour, 9 A.M.
And I'm gonna be high...
As a kite by then.

by Webster October 06, 2003
Expansion pack to Command and Conquer: Generals. Very good game, but some people obsess over it and are really gay.
"Syful you suck at ZH! You didn't even build a secondary econemy! Faggot!"
"So? I don't care, its just a stupid game."
"STUPID GAME! THAT GAME IS MY LIFE!!! ROAR!"
by Micheal Jackson November 05, 2003
Addendum: Zero Hour referring to Midnite or the early AM.
I gotta get this done during the Zero Hour
by Jay K. September 24, 2003
Doomsday, The Last Day.
31/12/99 was supposed to be the Zero Hour but the Christian FundaMENTALists who prophesiced this are all losers.
by Brother Number One October 03, 2003
A time at night where everyone's asleep. And this is the only time to get something done at the sacrafice of sleep.
"The only time I can get anything done is during the Zero Hour"
by Jay K. September 24, 2003
When you are listening to the radio and there isnt good music, and when you only have the choice to listen to Kelly Clarkson!!!
Fuck! its the zero hour. This trip is gonna be long one.
by Enrique April 04, 2005
The Zero Hour Theory states, that in the event of daylight savings time (taking place only during the “fall back” daylight saving switch) You are given an extra 59 minutes during your day. Not only are you given an extra 59 minutes, but…. In theory those extra 59 minutes never happened.

Think of it as this… for the 2010 Daylight Saving Time (taking place November 7th at 2am) the clock travels from 1:00 am to 1:59 am. When the clock is supposed to hit 2:00 am, it jumps all the way back to 1:00am (because you turn the clock back in fall vs. forward in spring). Thus giving you an extra 59 minutes (the first time the clock goes from 1:00am to 1:59), that theoretically never happened. So again, “in theory” for those 59 minutes that never exist, you should be able to do whatever you please, and get away with it….because hell they never happened. Look at this day as an excuse to celebrate and get a little extra crazy, go out and do something fun. Because in the Zero hour, anything goes.

***this is just a theory, not liable if you go murder someone or any of your actions for that matter***
“I just went and threw poop at a police officer, but it doesn't matter, it happened in the zero hour"

“You hook up with that fat girl?"

"Not technically, it happened in the Zero Hour"
by Anonymous54981 November 03, 2010

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