Derived from the Japanese word Seppuku, to cut open your stomach; or Harakiri. Another word is Swimicide. Committing suicide by swimming to the death, or losing a relay against Rin Matsuoka.
The fear of aliens anatomically similar to worms coming into your room at exactly 12:32 AM and handing you a grilled cheese sandwich. People typically get over this fear by lighting torches while they sleep.
Person 1: Why did you have torches lit in your room at midnight last night?
Person 2: I'm sorry, but I suffer from a chronic case of swimporrhaphobia.