The racial slur of the day is Fenian.

It is used to refer to Irish.

Deep lore: Refers to Irish Roman Catholic immigrants living in such large U.K. cities as Glasgow, Liverpool and Manchester. Also used by Protestants to demean Catholics in Northern Ireland. Irish republicans use it to identify themselves as a member of Sien Fienn, the political party of the IRA. Derived from Gaelic stories of the Fianna, a mythical group of warriors. Not inherently derogatory.