Definition of dum-dum in English:

dum-dum

noun

informal
  • A stupid person.

    • ‘Of course I care for her dum-dum, she's my responsibility!’
    • ‘Because we are free, people can choose to be dum-dums.’
    • ‘‘How can I forget my own daughter's birthday you dum-dum!’’
    • ‘Take advantage of him while he's here you dum-dum!’
    idiot, ass, halfwit, nincompoop, blockhead, buffoon, dunce, dolt, ignoramus, cretin, imbecile, dullard, moron, simpleton, clod
    View synonyms

Origin

1970s: reduplication of dumb.

Pronunciation

dum-dum

/ˈdəmˌdəm/