dum-dum

[ duhm-duhm ]

/ ˈdʌmˌdʌm /

Slang.

a silly, stupid person.

typical of a dum-dum: another dum-dum idea.

Origin of dum-dum

apparently reduplication and respelling of dumb

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? |Ramin Setoodeh |July 11, 2012 |DAILY BEAST
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 |Jessi Klein |October 15, 2008 |DAILY BEAST
I found a few hollow-nosed bullets, too, expanding like the Dum-Dum.

Ladysmith |H. W. Nevinson
The enemy used explosive and dum-dum bullets, and sniped off any of our wounded lying exposed in the open.

The Seventeenth Highland Light Infantry (Glasgow Chamber of Commerce Battalion) |Various

The bullet, fired at close range, had been almost as destructive as a dum-dum.

A Lively Bit of the Front |Percy F. Westerman
I must warn you not to use Dum-Dum bullets, or use the flag of truce treacherously.

South Africa and the Transvaal War, Vol. 2 (of 6) |Louis Creswicke
Northward, the city stretches away three long miles, with three more miles of suburbs beyond, to Dum-Dum and Barrackpore.

From Sea to Sea |Rudyard Kipling