Comparative form of chippy or chipper; more lively, cheerful, and energetic than before.
From chippy or chipper (adjective) + comparative suffix -er, following standard English patterns for forming comparative adjectives (like 'happier' from 'happy').
English uses systematic comparative and superlative forms ('-er' and '-est') for short adjectives—this pattern is so regular that we automatically understand 'chippier' and 'chippiest' even though most people never use them.
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