What is Nighty-night?
1.
Good night! Usually said when it's late into the night.
Nighty-night, me lovelies! Think big now.
(From Wallace & Gromit - The Curse of the Were-rabbit)
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2.
Good night! Usually said when it's late into the night.
Nighty-night, me lovelies! Think big now.
(From Wallace & Gromit - The Curse of the Were-rabbit)
See
3.
To go unconscious or pass out.
He went " nighty-night " when he got hit over the head by the snowball.