Houdini
Leaving the party without saying goodbye to a single soul. Elsewhere known as an Irish goodbye.
Where's Seánie?" "He pulled a Houdini an hour ago, his coat's gone an' all.

Shall I translate it into posh English for you, boss?
Good heavens, a guest! Here it is in posh English.
"Where has young Seán gone?" "He vanished without farewell an hour since. His overcoat has departed with him."
Questions
What does houdini mean in Ireland?
Leaving the party without saying goodbye to a single soul. Elsewhere known as an Irish goodbye.
How do you use houdini in a sentence?
“Where's Seánie?" "He pulled a Houdini an hour ago, his coat's gone an' all.”
Updated
On the list: Irish slang words