1.) When you pre-game like you would if you are going out but instead you go to bed after.

2.) When you have the full intention on going out but you don’t make it past the pregame and you have to get carried to bed.
1.) Bro me and my girl did a little nighty night last might and I woke up still inside her with 15 minutes to get to work.

2.) Watch that dude pull another nighty night tonight lmao.
by Zachy October 26, 2020
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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)
by Peter Lu October 20, 2006
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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)
by Peter Lu October 20, 2006
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"It's time to put on our nighty-nights, sweetheart."

"Where are my nighty-nights?"

"Yay! I get to wear my nighty-nights to school tomorrow!"
by Amara Marie January 13, 2016
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Means to kill a nigga when dey talkin like a fuckboii. Refers to da sleepin bag. (Body bag)
Nighty night nigga ima put yo ass in da sleepin bag bitch.
by NiggaInDaHood December 26, 2011
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