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."