It's a formal and polite way to say goodbye, often used in more formal situations.
It is pronounced "slan lyaht".
Here are some other ways to say goodbye in Irish:
* Slán: This is a more informal way of saying goodbye.
* Slán go fóill: This means "goodbye for now" and is a more affectionate way of saying goodbye.
* Beannachtaí: This means "blessings" and is a very formal way of saying goodbye.
* Dia dhuit: This means "God be with you" and is a more traditional way of saying goodbye.