Lackaday interj. : Alack the day; alas; -- an expression of sorrow, regret, dissatisfaction, or surprise.

Example:
what does "oh Lackaday" mean?

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Defination from the web:
lackaday from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "lackaday" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this page: Products ...