puttyhead

putty head

slang A foolish, stupid, or idiotic person—i.e., someone with putty for brains. Sometimes hyphenated or spelled as a single word. It's no surprise to me that the country's economy is tanking with that putty head in charge. How can you be such a putty head about this? Only a putty-head like you would think that.
See also: head, putty
Farlex Dictionary of Idioms.

puttyhead

n. a stupid person. (As if the person’s head were soft as putty. Also a term of address.) Look, you silly puttyhead, shut up!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • kissy
  • kissy face
  • kissyface
  • in demand
  • muckety muck
  • makeout artist
  • make-out artist
  • dum
  • dums
  • bleeding edge