Derogatory term used in Ireland to describe anyone who believes British (i.e. English) culture, goods or whatever to be invariably superior to their Irish counterparts. Not necessarily living in Dublin, although the capital boasts at least its fair share of them.

When someone goes to the gym and spends 90% of the time on their phones scrolling through social media

A person from Dublin who wishes that secretly wishes Dublin was part of Britain as they are so superior to the rest of Ireland

Traditionally, it was a derogatory term used in Ireland to describe anyone who believes British/English culture was superior to their Irish counterparts. In recent times, it has been used in Wales as in the same derogatory way to describe British/English culture/politics over the Welsh counterparts.

Brits (sometimes but not necessarily with Irish ancestry) who live or frequently holiday in Ireland and who love Ireland, the Irish and the Irish Celtic culture - often adopting Irish expressions, mannerisms and accents - and also often to the point of wishing/imagining that they were/are actually Irish, or at least more genelogically so. Not to be confused with any derogatory meaning for the snobbery of a belief in any Brit/anglo superiority.