dumb-dumb

dum-dum

slang Someone who is very stupid. Can you believe that dum-dum is still pushing the door marked "pull"?
Farlex Dictionary of Idioms.

dumb-dumb

and dum-dum
n. a stupid oaf; a dullard. Marvin is no dum-dum. He just looks that way.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • dum-dum
  • dums
  • dum
  • on one's
  • on someone's
  • run someone out of town
  • save someone's skin
  • (Have you) been OK?
  • pillow-biter
  • do someone or something justice
References in periodicals archive
And he made it clear he is not a fan of the former Foreign Secretary, concluding his verse: "Then I heard a mumble grumble and I turned I nearly stumbled, I thought it was a womble but it was that Tory dumb-dumb.
Boris Johnson's neighbour delivers scathing rap about leadership hopeful; The man, who calls himself Too Many Ts, performed on the steps of his Camberwell home after reports police had been called to Mr Johnson's home
I'm not a dumb-dumb. If I see a threat, I'm out of here," he said.
Geologists: Explosive event possible at Hawaii volcano
So surely even an absolute dumb-dumb like him would figure the chances of being rumbled a second time - and losing his wife and child - weren't worth the risk.
'When a prostitute has better morals than you, it's time to worry' THE SHAME OF WAYNE VERDICTS
I was no good at sports and I was a total dumb-dumb. I had no future at all.
Hopkins, the star-struck teen who sought out Richard Burton's autograph - but who never fitted in with the British 'theatre dahling' acting set; Sir Anthony says legendary Welsh star inspired him to find success
They aren't titans of talent, just dumb-dumb dregs in dunce caps.
Ignorance is no excuse for the mess we're in
Pantoliano has a thanklessly dumb-dumb role, and without a defined character of any sort, Fichtner gets through on solid instincts.
The Moguls
It showed a clip of a child quoting his mom calling the Australian leader as Tony Dumb-Dumb.
Tony Abbott Mocked in U.S. News Program, Aussies Cringe on Twitter
There is bound to be plenty of quizzes down the Dog And Duck and you don't want to be dubbed a daft dimwit of a dumb-dumb.
50 fascinating facts to amaze your friends
According to Turner, an avid proponent of global depopulation, "people who abhor the China one-child policy are dumb-dumbs...."
UN Attack on World Population