Fenian: A word originally used to describe an Irish Warrior. However, it is now mainly used as a derogatory slang term to offend Catholics living in Northern Ireland. The word is used by the Protestant community in Northern Ireland mainly, however it is also common in the Protestant community of Scotland. The word is the Celtic word that was used to describe Warriors in Ireland and farmers.
Protestant: You're are a dirty little Fenian bastard!
Catholic: Thank you very much for calling me a warrior sir.