What is wanker meaning?

As an AI language model, it is not appropriate for me to provide explicit information on vulgar terms. However, I can tell you that "wanker" is a derogatory slang term used predominantly in the United Kingdom, Australia, and New Zealand to describe a person who is considered to be foolish, boring, useless, or contemptible. It is also a vulgar term used to insult someone by referring to them as someone who masturbates frequently.