The verb {yay'} is given as "be shocked, dumbfounded".

As I read in m-w, the verb "shocked", is usually used for something, which upsets people.

And as far as the "dumbfounded" goes, I couldn't make sense, whether it has an inherent positive or negative meaning.

So, does someone know, if {yay'} is to be used only for pleasant or only for unpleasant surprises ?

~ bara'qa'