A flibbertigibbet is a very silly chatterbox. If your teacher calls you a flibbertigibbet, she clearly doesn't think you're a serious or scholarly person.

The noun flibbertigibbet is a colorful — if slightly old fashioned — word for a ridiculous busybody, someone who talks and gossips a lot but doesn't have much of any substance to say. It's most often used to talk about a frivolous young woman. Flibbertigibbet is a Middle English invention, a word that sounds like meaningless chatter, and it's still used fairly often in Yorkshire, England.

Definitions of flibbertigibbet
  1. noun
    a foolish, flighty, and overly talkative person
    synonyms: foolish woman
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    type of:
    fool, muggins, sap, saphead, tomfool
    a person who lacks good judgment
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