xerulence is a condition quite common in male office workers; they are in the habit of going over to the photocopier area to release any farts they have brewing, hoping that the noise and smell of the photocopier will mask the sound of the fart and noxious gases thereof. It doesn't.
Can you copy these papers please, oh hang on give it a few minutes, Ken's over there and he has chronic xerulence.
When you are convinced that you are about to fart loudly in a public place and when, you can hold it no longer, the fart is released it actually just makes a small squeak then you have committed a Frompton.
I was in class and was sure I was brewing one big enough to blow the roof off but, to my relief, it was just a Frompton.