fnarr fnarr

 
Pronunciation: /fnɑː ˈfnɑː/
(also fnar fnar)

exclamation

British informal
  • used to represent sniggering, typically at a sexual innuendo: That’s some package! (Said the bishop to the actress, fnarr fnarr)

Origin:

1980s: perhaps imitative of the sound of suppressed laughter