Definition of niff-naff in English:

niff-naff

noun

mass nounBritish
dialect
  • Details, considerations, or pieces of information of little value or importance.

    ‘do not worry about all this niff-naff’
    • ‘He was disappointed at the "niff naff and trivia" being raised at the meeting.’
    • ‘There are a probably a plethora of niff-naff details and laws, regulations, and procedures that could be examined.’
    • ‘Lift up your eyes from the niff-naff about the campaign.’
    • ‘The users get their knickers in a twist over trivia and niff-naff on the site.’
    • ‘The rest is irrelevant niff naff you'd only doze through anyway.’

Origin

Early 19th century: of uncertain origin.

Pronunciation

niff-naff

/ˈnɪfnaf/