Maggot

n.

Heard in Waterford and Cork

A messer or joker; one who teases or plays the fool.

In use

Gway out of it ya maggot and stop blackguarding them yungwans tellin' em ye've a B M doubleya!

Posh English

Go away out of that, you rascal, and stop teasing those young ladies by telling them you own a BMW!

Same phrase, other counties