Green’s Dictionary of Slang

ducky adj.

also duckie
[duck n.1 (3); an example of the supposed charm of farmyard animals; late 20C use generally ironic]

sweet, delightful, charming.

[Aus]Bell’s Life in Sydney 12 July 3/1: As for his moustaches, they are [...] ‘duckies‘ and perhaps the most perfect erinegerous adornments that ever graced a biped’s mousetrap.
[US] ‘The Stirabout Pot’ in My Young Wife and I Songster 37: Her principal bit of furniture / Was a ducky little stirabout pot.
[Aus]Bulletin (Sydney) 9 Oct. 2/3: A jaunty little cap, and a pair of the duckiest little shoes.
[US]Dodge City Times (KA) 11 July 3/4: A butter-fly dude of Cimarron calls [...] quite often to see his ducky-jewlarker.
[UK]Kipling ‘The Moral Reformers’ in Complete Stalky & Co. (1987) 132: I’m only goin’ to take off one ducky little whisker.
[UK]G. De S. Wentworth-James Purple Passion 39: It’s a ducky place [...] Everybody loves it – you’d love it!
[Ire]Joyce Ulysses 347: Baby looked just too ducky, laughing up out of his gleeful eyes, and Cissy poked him like that out of fun in his wee fat tummy.
[UK]H. Ashton Doctor Serocold (1936) 121: All those ducky little islands.
[US]R. Chandler Lady in the Lake (1952) 5: Perfumes in little pastel phials tied with ducky satin bows.
[Aus]Cusack & James Come in Spinner (1960) 244: We’ve got the duckiest little flat at Point Piper.
[UK]D. Hamilton Death of a Citizen 76: I saw that the damn little heap [...] had a ducky little miniature air-conditioning unit under the dash.
[UK]B. Aldiss Hand-Reared Boy 131: Oh, you’ll look so ducky in nursing uniform.
[US]W.J. Caunitz One Police Plaza 159: Oh, that’s ducky.
[US]Eble Campus Sl. Apr. 3: duckie – in style.
[UK]S. Grafton O is for Outlaw (2000) 271: ‘I’m tied up tonight, but how’s Monday. Does that work?’ ‘Sounds ducky.’.