nighty-night

[ nahy-tee-nahyt ]
/ ˈnaɪ tiˈnaɪt /

interjection Informal.

Origin of nighty-night

1875–80; reduplication of (good) night; see -y2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for nighty-night

  • If you're a good boy, maybe I'll kiss you when we say nighty-night.

    Babbitt|Sinclair Lewis