fathead fathead /ˈfæthɛd/

noun

1. A man who is a stupid incompetent fool  ( bozo , cuckoo , fathead , goof , goofball , goose , jackass , twat , zany )
   a man who is a stupid incompetent fool
     John's stubborn behavior earned him the nickname "jackass" among his friends.
   John's stubborn behavior earned him the nickname "jackass" among his friends.