A term of derision (or endearment) formed by joining the word "dumb" and the word "cunt" into a descriptive noun. The term is NOT gender specific, although it is most commonly directed at males, by other males (esp. in Australia).
So then I asked specifically for "nothing else but a single Big Mac, please", and then this dumbcunt asks me if I wanted "just the burger, or the meal deal". What a douche.
To be put down in an offensive manor worse than that of a cunt. More stupid than a donkey or a suit wearing to summadayze cronnie. And as pungent as the worse case of toe rott from the west african region of Tunisia. To be known as a Dirty Dumbcunt would be an insault worthy of the lowest of scumbags in the dirtiest of company. Or Hawthorne suporters.