Definitions

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

  • intransitive v. To fall with a sound like that of a heavy object falling rapidly into water.
  • n. A kerplunking sound or movement.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A thudding or thunking sound.
  • interj. A thudding or thunking sound.

from The Century Dictionary and Cyclopedia

  • With a sudden ‘plunk’ or plunge.

Etymologies

ker-, intensive pref. (probably from Scots) + plunk.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From ker- +‎ plunk. (Wiktionary)

Examples

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