"Mach es dir selber" literally means "do it yourself". That would be a sharp enough rebuke, as a witch's rebuttal of a muggle's plan to waste witch lives, but in German/Karlslandic it has an added dimension, because in that language it's also a minced profanity of a high order. It is so commonly assumed to be a way of saying "go fuck yourself" without actually using foul language that, culturally, it has essentially become foul language.

You really don't want to get on the wrong side of Minna, is what I'm saying. :)

--G.
-><-
Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod
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Ceterum censeo Carthaginem esse delendam.