Fenian noun an Irish catholic UK From the American-Irish “brotherhood” for the support of the revolutionary overthrow of the English government in Ireland.
[H]ow happy he was back in the Old Regiment over in Ireland, best days of his life, Paddy bashing, fuckin Fenians and cuntin Prods as well, cos they’re all shit-shovelling Micks, ain’t they, all the same. — J.J. Connolly, LayerCake, p. 109, 2000