What is the meaning of Bludger?

A pimp, a man living off the earnings of a harlot.

A person who avoids working, or doing their share of work, a loafer, a hanger-on, one who does not pull their weight.

A widespread species of large marine fish, Carangoides gymnostethus, in the jack family, Carangidae.

A ball used in the sports of Quidditch and Muggle Quidditch.

Source: wiktionary.org