/ Dictionary / Index D dum-dum: Meaning and Definition of Find definitions for: dum-dum Pronunciation: (dum'dum"), [key] — Slang. Slang. —n. a silly, stupid person. —adj. typical of a dum-dum: another dum-dum idea. dum•dum Pronunciation: (dum'dum"), [key] — n. a hollow-nosed or soft-nosed bullet that expands on impact, inflicting a severe wound. Also called dum•dum Pronunciation: (dum'dum"), [key] — n., adj. dum-dum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dum-dum (Thesaurus) dumbwaiter Dumdum fever Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language