A riff on "hornery" which is the sensation of being ornery due to being horny. It is the irritability that accompanies moments of celibacy.
Horneranxious is horny + ornery + anxious. The word adds the anxiety component of moments of celibacy.
It can also mean that you have so much stress in your life that you need to fuck frequently to relieve tension.
My man is writing his dissertation, which is making him uber horneranxious.
I have a big interview tomorrow. I'm horneranxious. Can we fuck already?