Phrase Detail

Say: narny-uuk-narny-uuk-min muum-belm

Vowels: Standard - 'a' as in ‘path’, ‘u’ as in ‘put’, ‘i’ as in ‘hill’, 'e' as in ‘pen’.
Consonant combination - 'ny' (palato-nasal) combine 'n' and 'y' while top of tongue touches hard palate plus nasal vibration. (Avoid the English 'nee' as in 'many').

'Nyanyuk-min' (other or different) may have developed from the pronoun 'nyanya' (what). It is a pronoun that starts a question sentence (interrogative pronoun) eg 'nyanyararr kiya' (what-you saying?). 'uk' is a noun possessive ending for 'his', 'her', 'it's' which in this case has been added to a pronoun to make 'nyanyuk' (what-his). The 'min' is a 'post-position' added to a word to emphasise meaning. 

So the phrase becomes something like 'what-his WHAT-HIS hat?' It would be used when the person talked about is always doing a different thing. In this case 'wearing a different hat every day'. Fluent speakers would probably use the phrase for a range of topics.