Demon Farts

Definition:

Any odor or noise that comes from your furnace.

Exemplification of usage:

Me: I hate when the furnace is just fired up in the fall - it smells and it's noisy. Them: Time to get used to those demon farts. Once up and running, they diminish. Me: Right? I just have to get used to it.

* Image by Dean Moriarty from Pixabay