There are 2 definitions of never-never in English:

never-never1

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noun

(the never-never) British informal
Hire purchase: buying a telly on the never-never
More example sentences
  • They instructed hire-purchase companies to make the never-never more finite.
  • Perhaps we are too fond, in the current era, of living for the day, of buying on tick and the never-never.
  • In fact, as a result of the last few months' boom in trade, the son went out and bought himself a new car on the never-never and the missus had done the same and ordered a new kitchen.
Synonyms
instalments, instalment plan/system, instalment-payment plan, credit, finance, deferred payment, easy terms; Britishhire purchase, HP; North Americaninstalment buying

Definition of never-never in:

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Word of the day guzzle
Pronunciation: ˈgʌz(ə)l
verb
eat or drink (something) greedily

There are 2 definitions of never-never in English:

Never-Never2

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Pronunciation: /ˌnɛvəˈnɛvə
 
/
1Australian The unpopulated desert country of the interior of Australia; the remote outback.
2 (Never-Never Land (or Country)) A region of Northern Territory, Australia, south-east of Darwin; chief town, Katherine.

Origin

mid 19th century: so named from the notion that one might never return from such remote country.