1. The fear experienced in the brief moments before getting wet in the shower. Common showernoias include the fear of cold water, and the fear of too much water pressure, etc.
2. The fear of being murdered in the shower.
1. I have showernoia every morning. My shower is like a fire hose from the north pole.
2. Ever since Psycho came out almost 100 years ago, people have had showernoia.