In good spirits; lively and cheerful; having energy or vigor.
From chip or possibly from the Scottish/Northern English 'chirp,' influenced by '-er' comparative or '-ed' past participle endings, though the exact origin is uncertain and may relate to brightness or quickness.
The word 'chippered' is mysteriously delightful—its origins are murky, but it perfectly captures that specific kind of energetic cheerfulness we see in quick-moving animals and lively people, suggesting English speakers once needed this exact word.
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