Have a word with yourself
Cop on. Said to someone talking nonsense or acting the eejit.
Ah Jaysus lad, have a word with yourself, ye can't wear shorts to a funeral.

Shall I translate it into posh English for you, horsebox?
Good day, good sir or madam. Here it is in posh English.
Good heavens, man, do reconsider. One cannot wear shorts to a funeral.
Questions
What does have a word with yourself mean in Ireland?
Cop on. Said to someone talking nonsense or acting the eejit.
How do you use have a word with yourself in a sentence?
“Ah Jaysus lad, have a word with yourself, ye can't wear shorts to a funeral.”
Updated
On the list: Irish slang phrases