A head that is dumb.

When you eat dirt for the first time and leave your family to build a shack in the woods

word to call someone when you can't think of anything else to call them.

Dumb head is used when a person is acting extremely idiotic

someone who is extemely dumb. They typically have a dumb face or dumb nature.
Half of the time, these people are not really unintelligent, but are just responding to a situation with lack of common sense.
People are usually referred to as dumbheads when the are drunk or do not agree with you.

A nickname that your friend so rudely calls you only because your initials are DH.