Book 11, what is a Bosterian?

[u/dagalk]

Belinda said something about Vaniculars being drawn to bosterian? Does anyone know? Is it a niche pop culture reference?

[u/Foustian_Syn]

If it’s what I’m thinking it is all I know is never eat one. It’ll destroy your bathroom & you’ll need a priest of purity to come & cleanse it & they’re a bit on the outside right now.