What is the meaning of plop?

noun

• The noise of a rounded object dropping into a liquid without a splash.

verb

• Drop something with a plopping sound.
• Drop with the sound of something falling into water.
• Set (something or oneself) down with or as if with a noise.
  • usage: "He planked the money on the table"; "He planked himself into the sofa"
  • synonyms: plank, flump, plonk, plunk, plump down, plunk down, plump

adverb

• With a short hollow thud.
  • usage: "plop came the ball down to the corner of the green"
  • synonyms: plunk