If i ever use it that's what i'd say, but i think the original is 'het kan me aan m'n reet roesten' (it can rust on my ass). But i agree ass is a better translation than anus.

Beside this one, Dutch also has an infinite variations of 'i don't give a damn/a fuck' (het kan me geen moer/bout/biet/donder/bal/… schelen) and also we have variations on something similar to the German one (het zal mij een worst wezen) though i'm not sure how to give an accurate translation, something in the along the lines of 'i wouldn't care even if it was a sausage' or more literally 'it could be a sausage to me'

Clearly i care to much to keep my mouth shut lol