What is the meaning of Plunk?

To drop or throw something heavily onto or into something else, so that it makes a dull sound.

To land suddenly or heavily; to plump down.

To intentionally hit the batter with a pitch.

To croak.

To pluck and quickly release (a musical string).

To be a truant from (school).

The dull thud of something landing on a surface.

A large sum of money.

A dollar.

Source: wiktionary.org