EBR

Actually, it's both! I assume because White Sand hasn't been edited for consistency, but both terms are used in the text. "Hundred Idiots" is used first (by Praxton, Chapter 1) but it becomes "Hundred Fools" later (Kenton's internal monologue, Chapter 12). PS. Apologies for post-necromancy, I was looking for this exact answer, and DuckDuckGo brought me here.

Forgive me if I'm missing the mark here, but is that not how most cursing works, with the context explaining the use?

Drehy swears by "the Brightcaller's rays," although Brandon is presently still RAFOing that one.