kerplunk

A sound of someone or something falling and landing heavily.

If my life were a Saturday-morning cartoon, you would have heard a loud kerplunk as my stomach dropped. My poor starving stomach. It was under such stress already, and now this.

A disappointment which comes as a surprise.

Used to indicate a thudding sound.

We flipped to see who'd go first and I won, which meant Claudia had to dial. I called the number out loud for her, and inside me my heart was suddenly going "kerplunk, kerplunk, kerplunk," heavy as an elephant's feet.

To make the sound of falling and landing heavily; to thud.