A nonstandard or informal comparative form of 'good,' used colloquially instead of the correct 'better'.
A folk or colloquial creation, likely from children's speech or dialect, where speakers applied the regular comparative suffix '-er' to 'good' as if it were a standard adjective, rather than using the irregular form 'better'.
Language learners and children often say 'gooder' because English is full of weird irregular verbs and adjectives—'good' refusing to follow normal rules shows how broken English grammar patterns are when you really think about it.
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