The term "mook" has different meanings depending on the context. Here are some of the definitions found in the search results:

• A foolish, insignificant, or contemptible person.
• An incompetent person.
• An affectionate term for a regular guy who is unpretentious.
• A street musician or performer.
• Faithlessness or treachery.

It is worth noting that the term "mook" is considered slang and may not be widely recognized or used in all regions or social groups.