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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
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2
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
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3
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
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4
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
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5
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
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6
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
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7
when you wake up in the middle of the night from a bad nightmare
Dang! Now, this is the zero hour
by jerk October 05, 2003
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