Shtuff
Stuff, with the sh that plenty of Irish tongues slip in before a t. Same goes for shtop, shtick and shtrange.
Also spelt Schtuff
Get yer shtuff off de table before yer dinner goes cold.

Shall I translate it into posh English for you, boss?
Ah, at last, someone civilised. Here it is in posh English.
Kindly remove your belongings from the table before your dinner grows cold.
Questions
What does shtuff mean in Ireland?
Stuff, with the sh that plenty of Irish tongues slip in before a t. Same goes for shtop, shtick and shtrange.
How do you use shtuff in a sentence?
“Get yer shtuff off de table before yer dinner goes cold.”
Updated
On the list: Irish slang words