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diddums!

exclamation
 
/ˈdɪd.əmz/ UK humorous

Definition

something you say to show that you feel no sympathy for someone who is behaving like a child: He called you a bad name, did he? Ah, diddums!InterjectionsSounds used as interjections
(Definition of diddums! exclamation from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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