We found one dictionary that defines the word poor diddums:

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1. poor diddums: Wiktionary

▸ Words similar to poor diddums ▸ Usage examples for poor diddums ▸ Idioms related to poor diddums ▸ Wikipedia articles (New!) ▸ Words that often appear near poor diddums ▸ Rhymes of poor diddums ▸ Invented words related to poor diddums