Definition of spiffing in US English:

spiffing

adjective

British
dated, informal
  • Excellent; splendid.

    ‘how spiffing you look!’
    • ‘Two viewpoints sounds spiffing to me (if a little confusing at first)!’
    • ‘My boyfriend and I will be together 2 years next week, which is highly spiffing.’
    • ‘This is a spiffing example of someone who was physically prepared to deal with a bad situation.’
    • ‘A spiffing new parlour game for the chattering classes has come to our attention.’
    • ‘I must say though that WH's book on Pit The Younger is very spiffing.’
    very good, superb, outstanding, magnificent, of high quality, of the highest quality, of the highest standard, exceptional, marvellous, wonderful, sublime, perfect, eminent, pre-eminent, matchless, peerless, supreme, first-rate, first-class, superior, superlative, splendid, admirable, worthy, sterling, fine
    View synonyms

Origin

Late 19th century: of unknown origin.

Pronunciation

spiffing

/ˈspifiNG//ˈspɪfɪŋ/