Gobshite
Heard in Dublin, Cork, Wexford and Westmeath
A distinctly Irish term of abuse for a person of poor judgement and low intelligence whose incompetence creates problems for everyone around them. Often used in constructions such as 'and then that fucking gobshite...' followed by an account of the resulting disaster.
Ah shut up ya gobshite." "If someone does or says something stupid ya say ya gobshite ya...
Do be quiet, you tiresome incompetent. If someone behaves foolishly one exclaims, you absolute incompetent!