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Short for "No Reason Hornyness."
The female version of a nrb(no reason boner).

When you are super bored and/or Procrastinating on a topic and become super horny.

This can be associated with random horny day dream of your dream man and/or a celebratory.
"Hey Sally, how was studying"

"When studying at home, I got NRH. It was so Random"
by Bluesteel16 September 30, 2014
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