Comparative form of dippy; more silly, scatterbrained, or eccentric than someone or something else.
From dippy (from dip + -y meaning having the quality of, suggesting someone who dips their head or acts light-headed) + -er for comparative. Slang origin from early 20th century.
The word 'dippy' became slang for silly people in the 1920s, possibly from the image of someone 'dipping' their head down thoughtlessly—language records how each era mocks the quirky characters around them!
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