Plunk meaning : The dull thud of something landing on a surface. A large sum of money. A dollar. 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. (of a raven) To croak. To pluck and quickly release (a musical string). To be a truant from (school).