
© & ™ Hanna-Barbera Flibbertigibbit

/ˈflibərdēˌjibət/
noun
1. a frivolous, flighty, or excessively talkative person. …definition from Google
Amy is a flibbertigibbit when she is nervous.
This word was first used in the 15th century. In Middle English, the word is flepergebet. – from Merriam-Webster
Does anyone know what famous musical includes a song with this word in it?