Superlative form of chippy or chipper; most lively, cheerful, and energetic; having the maximum degree of this quality.
From chippy or chipper (adjective) + superlative suffix -est, following the same regular pattern as 'happiest' from 'happy' or 'saddest' from 'sad.'
The '-est' superlative suffix is so deeply embedded in English that we apply it automatically to new adjectives, which is why anyone can instantly understand that 'chippiest' means 'most chipper' even if they've never encountered it before.
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