A non-standard variant spelling of dippier; appears to be an error with triple 'p', but would theoretically mean more dippy if intended as comparative.
This appears to be a typographical error or unconventional spelling of dippier (dippy + -er). Standard English would not use this form with three p's.
Even in word lists, mistakes can slip through—this triple-p spelling is a reminder that dictionaries are built by humans who sometimes make typos, and spell-checkers are only as good as their programming!
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