Nacreous just sounds like a malefic word. It's full of bruncture and snart.
bruncture and snart is what now?
Bruncture is the 'dance' people do on the sidewalk when they are trying to get past each other, but keep getting in the other's way.
Snart, on the other hand, is an unexpected exhalation of gas through the nasal cavity.
Felix was having you on by pretending the two words are related.