What Does The Kankana-ey Expression "Yannay Ay" Mean?

Somebody asked me what does the expression "yannay ay" mean? This is a common expression among Benguet Kankana-ey speakers. 

What is it's closest equivalent in other languages? 

Maybe "what the hell"? That's the closest I can think of. Also, a close equivalent of it in the Ilocano language is "anya mu" or "anya metten".