@Bainhardt
This is a huge stretch but is it a pun between bore and voir? It seems like the accepted katakana spelling for voir is ボワール, which is the French verb to see.
So it'd be something like quantum tunneling/boring like Oeconomist said but they instead see something they shouldn't have...
Just wanted to say you're one of my favourite translators. I really like your explanation pages at the end of each chapter, going through your thought process for trying to localize puns, humor, etc. Just goes to show you're just a dude with a decent grasp on the Japanese language but are...