pigin (piggin) ejit

Often directed to young foolish and/or stupid children. Most probably of Irish and/or Scottish origin.

Stop rolling around in that mud boy, you pigin (piggin) ejit.
Will you calm down son and stop running arount like a madman, you pigin (piggin) ejit.
You pigin (piggin) ejit ya, youv'e gone and let the dog out.