

Hmmm there are quite a few of these… Ok these are UK/us mostly.
America: fanny - backside
UK: fanny - the other side (!)
America: rubber - condom
UK: rubber - something you use to erase pencil marks.
UK and others: Durex - Condom brand
Others: Durex - sticky tape
US: Suspenders - things for holding trousers up
UK: Suspenders - things for holding stockings up. Used with a suspender belt and with, or without, other underwear…
USA: Pants - leg coverings e.g. blue jeans
Most of the UK: Pants - things you wear under your blue jeans (unless ”going commando”)
Nah they aren’t shit, they are just poor traditional school fiction with added magic…
School fiction is a genre that has existed for ever and is always no better than “meh” imho. The Potter books are definitely at most meh but not as bad as shit.