1. placing or setting something down heavily or carelessly
Usage: present participle of plonk

1. making a dull, heavy sound when dropped or placed
Usage: informal

Examples

• She was plonking books down on the table without care.
• He kept plonking his feet on the coffee table.
• The plonking sound of the heavy box hitting the floor woke everyone up.
• Stop plonking your bag on my desk every morning.
• The plonking noise from upstairs was getting annoying.
• They were plonking dishes in the sink after dinner.