Experience with English and Norwegian (should probably have sourced it), but also from wikitionary. There are some audio examples here: https://en.wiktionary.org/wiki/slut

IPA for the word “slut” is /slʌt/, the upside-down V sounds like this. While not exactly the same sound as Ø, the audio examples on wikitionary for “slut” sounds closer to Ø for me, as I use Ø daily in Norwegian.

Edit:

Norwegian uses this sound for the “u” in “slutt”, the full IPA for it is /ʂlʉtː/. For some reason there isn’t IPA for “slutt” in Bokmål, but the Nynorsk pronunciation is the more or less the same. Sadly there isn’t an audio recording of the word on wikitionary, but it has a double consonant which is a fun rabbit hole in Norwegian.

Sure, except the Norwegian spelling is “slutt”. The pronunciation is a bit different from the English word “slut”, the English one uses more of a ø-sound for the u. “sludd” is the Norwegian word for sleet, which is a mix of snow and water, this is even stated by your sources.

Surely THIS will get price of eggs down.