Phrase Detail

Say: moh-yii-kuu tyahk

Vowels: Standard - 'o' as in ‘on’, ‘i’ as in ‘hit’, 'u' as in 'put', 'a' as in ‘path’ or ‘car’.
Consonant combination  - 'ty' (palatal stop) - combine 't' and 'y' while tip and blade of tongue touches hard palate and stops the breath. (Note: 'tch' is close but different to 'ty'.)  (Avoid the English 'tee' as in 'city'.)

'Moyiku tyak' is an unusual WW phrase and would normally only be used in a song. To the directional adverb 'moye' (this way) has been added an ending 'ku' and to the noun 'tya' (ground) has been added 'ka' the ending to show 'movement towards'

A song - The song recorded with this phrase 'moyiku tyak' in it was about the trials that the spirit of a recently dead relative (grandmother) had to escape to get to the land of the dead. The line was - 'Pirku-pirku-pirkuwak' (Undo, undo, Oh undo the net!), 'Yukuwak moyiku tyak!' (Put it down this way to the ground!) 'Kuyin-kat-min!' (Go on, go on like mad!)  'Wirriki! Tirtenayuk.' (Run! There is new one.) 'Mala nginan parrangguniny-kat!' (That one will certainly kill you.).
Create - Create a song that includes - 'Yukuwak moyiku tyak!' (Put it down this way to the ground!). 
What could a person be holding that it was important to put down on the ground? Who might be holding it? What happens when they put it down?