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A combination of "dumb" and "retard". Very similar to "tard" and "f***tard" commonly in use today. The beauty of this term, however, is that it avoids slandering those who are truly mentally retarded and doesn't come across as being overly vulgar and offensive. Best used when someone has shown a momentary lack of intelligence and reasoning in offending you in some way.
Bob: "That guy just cut me off AND he's driving slower than me! Man, some people!"
Larry: "What a f***tard!"
Bob: "Well, maybe so if he did it on purpose. For now, I just think the guy's a dumtard."
Larry: "Suit yourself."
dumtard by GarthF December 16, 2005
Related Words
Someone who is extremely stupid. They are more than dumb, and worse than retarded because they should know better.
That dumtar cut me off and then got into the wrong lane.
Dumtar by NEOeonone September 27, 2008

Dumtarded 

A horrible moment in time. Exhausting and not wanted.
My work has me doing the dumtarded shift again.
Dumtarded by Schmoovie May 9, 2018
a person who acts dumb and retarded even though they may not be....stumbling adolescent male.....growing person not used to body growth, person asking question that is already answered, drunk person.
that boy is such a dumtard, he fell over a pebble.
that person is such a dumtard, she asked if the plastic bags at kroger were free.
I woke up and forgot where I was....(dumtard)
dumtard by robyn lusby January 30, 2007
an uncontrolled outburst of anger and frustration, typically in people hold highest power,
The newly appointed president of United States has temper dumtrums if he cant get his own way.
Dumtrum by StackAndFlow February 6, 2017

Dumtardo 

People who are both a dumbass and retarded.
Martina is cute, but she's such a dumtardo
Dumtardo by bobsmith456789 August 22, 2011