On the never-never
Definition 1 of 1
Pro Tip 1/3UK Common Use
The phrase is mainly used in the UK, so it's most recognized and understood there. 
John decided to buy his new TV on the never-never, as it's quite common in the UK.
Pro Tip 2/3Colloquial Term
It's casual language, used in informal situations, not in formal finance documents. 
I'm a bit short on cash, so I might get these shoes on the never-never.
Pro Tip 3/3Installment Payments
It refers to installment payments, where you pay a small amount regularly. 
They got their new couch on the never-never and will pay a bit each month.
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