A redundancy in military jargon signifying the exact hour for an operation to begin. Big "H" for "big hour".
The invasion of the enemy held island began at H-Hour, 05:00.
by Joe Rodolico February 9, 2007
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H hours is wen a male or female begins to feel horny around the time of 12:00
Yo look at the time it’s finna be h hours soon
by Chapaingepapi September 27, 2018
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Pronunciation: Ay-Chow-ær
noun

The hour long session of creative genius in which one has high thoughts and shower simultaneously.
“Bro I had a craaazy H-Hour when I got home from our sesh.”
by Bottlecap June 5, 2022
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