H-Hour 

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.

H-Hour by Joe Rodolico February 10, 2007

H-Hour 

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.”

H-Hour by Bottlecap June 5, 2022

h hours 

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

h hours by Chapaingepapi September 27, 2018