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Wiktionary
slumber party

n. a party where everyone is dressed in pyjamas, or otherwise dressed for bed

WordNet
slumber party

n. an overnight party of girls who dress in nightclothes and pass the night talking

Wikipedia
Slumber Party

Slumber Party is an indie rock band from Detroit, Michigan. In 2000, 2 years after the band's formation, they signed to Kill Rock Stars.

Slumber Party (Bob's Burgers)

"Slumber Party" is the ninth episode of the fourth season of the animated comedy series Bob's Burgers and the overall 54th episode, and is written by Scott Jacobson and directed by Jennifer Coyle. It aired on Fox in the United States on January 5, 2014.