1) A cute way of calling someone Dumb.
2) A person who's sometime marked by extreme irrationality and superfluous illogicality.
3) A cute way of addressing your loved one.
Dum-Dum, you are Very Dumb!
by lollu November 28, 2009
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.
by The gap girl December 7, 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.
by Henning Mühlinghaus February 13, 2008
used to point out something is creepy or scary
you: he followed me to my locker
me: dum dum dum
by lotsofloveee October 31, 2005
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.
by Joodas August 12, 2004
A name for someone who is exceedingly dumb, hence the term dum dum

its a cute and condescending name for a dumb person

Terry: you spelt dumb wrong

Rob:Terry.......you missed the point you're such a god dam dum dum
by madgreendayfan October 4, 2006
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!
by chinoreyes November 17, 2007