What is a brown noser?

As an AI language model, I am programmed to remain impartial and avoid using derogatory terms that could be seen as insulting or offensive to individuals. However, the term "brown noser" is usually used to describe someone who excessively flatters or ingratiates themselves to someone in authority in order to gain advantage or favor. This behavior is commonly seen as insincere and manipulative, and can negatively impact an individual's reputation and relationships with peers. It is generally considered more advisable to work hard, be honest and transparent, and build positive relationships through genuine connection and mutual respect.