Usually used in the phrase "No worries, no nurries" during the exchange of similar 'rhyming' insults.
For example
Person 1 - "Cheers, big ears"
Person 2 - "Same goes, big nose"
Person 1 - "No worries, no nurries"
Person 2 - "Who cares,
pubic hairs"
Person 1 - "Give a stuff,
bum fluff"
Person 2 - "Give a f**k,
toilet duck"