- a silly, stupid person.
- 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
Examples from the Web for dum-dum
He talks about attending the Dum-Dum convention in August, celebrating the 100th anniversary of Tarzan.What Happened to Big-Screen Hunk Casper Van Dien?
July 11, 2012
Should I email that dum-dum of a guy I know or just leave it in my draft folder?I'm in Love With David Gergen
October 15, 2008
Even the dum-dum does not invariably "set up" on striking an object.Khartoum Campaign, 1898
The bullet, fired at close range, had been almost as destructive as a dum-dum.A Lively Bit of the Front
Percy F. Westerman
She carried a light, sporting .303, its magazine loaded with Dum-dum cartridges.Forging the Blades
I found a few hollow-nosed bullets, too, expanding like the Dum-Dum.Ladysmith
H. W. Nevinson
My gun was loaded with Dum-Dum bullets, specially prepared for bucks.On Commando
Dietlof Van Warmelo