A pet name for someone who is stupid
Billy: 'what's that?'
Jenny: 'That's a cucumber you dumdum'
by a right jammy dodger September 3, 2007
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1. A dumdum is a stupid person, as described above.

2. A dumdum is also an OLD name brand of a sucker in America.
1. That guy sure is a dumdum. *eyeroll*

2. My favorite kind of sucker is a dumdum.
by IrishDaddy2U April 12, 2010
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A person who tells you sonething but if you didnt here it they wont tell you what they said
Dumdum: i know the meaning of life
You: what?
Dumdum: nothing!
by Good_evening101 November 9, 2017
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Used for a person when he/she shows just a momentary dumbness.
You: Wow, that's a lovely dog!
Me: That's a cat, dumdum!
by i am everest December 30, 2011
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a word for a boyfriend that does stupid and/or annoying stuff that makes his girlfriend annoyed or mad at him
what did Dumdum do now?
by dance geek March 11, 2014
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Zoë is a motherfcking idiot
Zoë forgot to sleep.
Zoë is a dumdum.
by Orlandojames March 9, 2020
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A bullet with deep user-made cuts in the tip. The cuts help the dumdum bullet fragment into chunks on impact, causing severe injuries and bleeding on a scale normal bullets would be incapable of. By definition, dumdums are less accurate than regular ammo.

Dumdum bullets are illegal for use in warfare and may be illegal for civilian ownership in the United States.

Also see dum dum.
The cops say Jimmy got shot in the gut with a dum dum bullet... it took him like five minutes to die, man - he was bleeding that bad.
by Tronno November 25, 2004
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