To seekfavour by sniffing the bumhole of a superior; hence "Brown-Noser".
"Blair brown-noses Bush like a good poodle, hoping to get a profitable lecture tour on retirement." (Prince Charles in a confidential memo to his secretary, 1998)
Someone who 'suck up'. He is a person of low or irrelevant technical standing wishing to distinguish himself by his presence and input at meetings for which he has a minimal or no understanding. Complimenting and Agreeing with senior staff and their poorly thought-out plans is the typical implementation of this position. The position is typically advertised under a job-pseudonym.
Look how Brown Nose sucks up to The Man in Beige! He makes me sick!