dum-dum or dumb-dumb [duhm-duhm]Slang. WORD ORIGIN noun a silly, stupid person. adjective typical of a dum-dum: another dum-dum idea. Liberaldictionary.com
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Origin of dum-dum apparently reduplication and respelling of dumb Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019