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a more brilliant way of saying that something is dumb-ish or someone is. dum-dum is "dumb" only that the b-sound is depleted and the new formed word is repeated twice to accent the state of being.
Omigosh! Here comes the dum-dum of the century!
dum-dum by chinoreyes December 16, 2007
A person who lacks both intelligence and common sense.
These people are worthless most of the time.
Candy from Two and a Half Men is such a dum-dum.
Ditzy people are all dum-dums.
Dum-Dum by The gap girl December 8, 2010
A sensational, scrumptious, pretty, big girl with huge boobs - a kind of ultra heavy bombshell. Sometimes/Often/Always (choose for yourself) such girls were a bit booby/dumb, so that the word dum-dum the silliness sounds too.
Matt, you know, Shirley is a dum-dum - she'll flatiron you, man, Hank said.
What a manner of death, Matt whispered enthusiastic, keeping his eyes glued to Shirley.
Dum-Dum by Henning Mühlinghaus February 13, 2008
A Dum-Dum is that stuffed animal that you always will keep with you until you die because you are a grown man that still lives in his parents basement that has nothing else to do in their life.
John- Yo Bob why do you still have that stuffed animal from when you where a kid, your like 36 years old?

Bob- Oh that, that's just the Dum-Dum I still have because I have nothing to do in my life accept eat Oreos and play video games in my parents basement. Why?

John- I don't know, just asking.
Dum-Dum by xLEGOxBEASTx June 1, 2020
A name used for people who did something so stupid that the word idiot is to sophisticated
He knocked her up and gave her his job instead of a ring. He is such a dum-dum.
Dum-dum by DutchBlondieNotStupid October 29, 2020
A term for a wide range of soft ammunition banned either at Geneva or at Hague.
Soft ammunition is considered inhumane because it expands on impact causing horrific wounds. Non-fatal injuries caused by soft ammunition are often untreatable and the victim either dies from infection or from internal bleeding.
If the cops catch you with those Dum Dums, you goin streight to jail.
dum dum by Joodas August 12, 2004