Definition of squiffy in US English:

squiffy

adjective

British
informal
  • Slightly drunk.

    ‘he's squiffy from the rum’
    • ‘Much gin was drunk, much inane rubbish and some serious stuff was discussed, and we all went home pleasantly squiffy.’
    • ‘You'd think I'd have learned long ago not to argue with those with a slightly squiffy glint in their eye.’
    • ‘In fact, shopping while slightly squiffy on cocktails is probably the closest any lady can get to heaven, in my opinion.’
    • ‘It's good to see that Gandalf has his human side, and gets squiffy at a post-Oscars party.’
    • ‘She'll drink a little if we go out for dinner, but never enough to get squiffy.’
    • ‘They leak, they give the wine a plastic flavour, they are nigh on impossible to remove with a cork screw when you're squiffy.’
    • ‘While we're of the subject of goats…… I have a friend who once got so squiffy at a party she signed up for a twelve week goat keeping course.’
    • ‘I protest that this is unfair as I am slightly squiffy, but they insist.’
    • ‘Do they mean anything, faces, Maggie would think to herself when she was a bit squiffy and had had one too many glasses of sparkly spumante.’
    • ‘I feel a bit squiffy… actually make that a lot squiffy.’
    • ‘She last played Scotland with Dreadzone at The Arches in Glasgow, where she remembers getting rather squiffy on port and not much else.’
    intoxicated, inebriated, drunken, befuddled, incapable, tipsy, the worse for drink, under the influence, maudlin
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Origin

Mid 19th century: of unknown origin.

Pronunciation

squiffy

/ˈskwifē//ˈskwɪfi/