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definitions
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dum-dum

or dumb-dumb

[duhm-duhm]Slang.
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noun
  1. a silly, stupid person.
adjective
  1. typical of a dum-dum: another dum-dum idea.

Origin of dum-dum

apparently reduplication and respelling of dumb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018