What's a dumbass ?

I was wondering what is the definition of a dumbass.
And I found it.


Dumbass :
- a stupid person; these words are used to express a low opinion of someone's intelligence
blockhead, bonehead, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead
dolt, dullard, pillock, poor fish, pudden-head, pudding head, stupe, stupid, stupid person - a person who is not very bright; "The economy, dumbass!"
And "shoulder cookie eating freak"