What is the origin of word kerplunk?

The origin of the word "kerplunk" is onomatopoeic, meaning it was created to imitate the sound it describes.

The word is thought to be a combination of "kerp" (a sound of impact or sudden movement) and "plunk" (a sound of a heavy object falling into water).

While there is no definitive historical record of its first usage, its origins are clear – it is a vivid and evocative word that perfectly captures the sound of something heavy falling into something soft or liquid.