A universal expression meaning yes. You can use it to say yes, even when you dont know the language. Of course, if you dont know the language, you dont know what you are saying yes to.
Brent: Hola, quiero darme todos tu dinero?
Joey: Ay!
Australian Slang: An abbreviation of the word "hey", sometimes used as an emphasizer at the end of a sentence. Most common in Queensland, particularly the north.
Bruce: What did you do today Bruce?
Bruce: I went to the pool ay!