Definition of diddums in English:

diddums

Line breaks: did|dums
Pronunciation: /ˈdɪdəmz
 
/

exclamation

British informal
Used to express commiseration to a child or, ironically, to an adult.
More example sentences
  • Unfortunately, it's not on This Is London, but gems included her having to move from Islington to a ‘£200,000 flat in Ladbroke Grove’ - aww, diddums!
  • Oooh, did Daddy not give you enough pocket money this week - diddums!
  • Max may not say, ‘There, there, diddums, Mummy kiss it better.’

Origin

late 19th century: from did 'em, i.e. 'did they?' (tease you, do that to you, etc.).

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