What is the meaning of Plonk?

The sound made by something solid landing.

The supposed sound of adding a user to one's kill file.

The sound of something solid landing.

To set or toss (something) down carelessly.

To sit down heavily and without ceremony.

To automatically ignore a particular poster.

Precisely and forcefully.

Cheap or inferior everyday wine.

AC Plonk

A female police constable.

Source: wiktionary.org