“It is said that I hate Les Non-Magiques. The Muggles. The No-Maj. The Can’t-Spells.”
-Gellert Grindelwald (CG)
“The Can’t-Spells” was a term for non-magical humans (CG).
This was one of the names for Muggles mentioned by Gellert Grindelwald when he rattled off a list of such terms while speaking to the pure-blood audience in the underground auditorium in Paris (CG).
Sort of a pun on "spell" as a verb and "spell" as noun.
Tags: anti-Muggle sentiment