'Good Yok' is a pharse spoken in the christchurch,
New Zealand.
The phrase is spoken as a sarcastic retort to
something a person might find laughable or untrue. 'good Yok' essentially means 'good joke'
It is not established whether 'Yok' is usable as a standalone word, some argue that there are no 'Yoks', only 'good Yoks'.
An
alternative spelling of Yok can be Jok.