Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Informal A stupid, gauche person; a blockhead.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a stupid or clumsy person
  • n. A coastal rockfish of California, Sebastodes chlorostictus.

from the GNU version of the Collaborative International Dictionary of English

  • n. A person with a large head; a numskull; a dunce.

from The Century Dictionary and Cyclopedia

  • n. A large or thick head; hence, a dunce; a numskull.

Etymologies

Possibly from chuck2.
(American Heritage® Dictionary of the English Language, Fourth Edition)
chuckle +‎ -head (Wiktionary)

Examples

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