This word is common in my country and means "¿Qué va a hacer?" ¿What are you gonna do? We usually say "quevacer" when someone is in an difficult situation and he/she has to make a decision at the moment. For instance: You must to go to the university tonight because you have an important test but it's raining and the car doesn't work... quévacer? The other person should make a good decision that solve his/her maze/problem. That decision is what he/she gonna do. I hope it may help you. Sorry for my not good english :)

It's an abbreviation of "¿Qué va a ser?" I think it's like "Are you serious?" or "It's not possible!". I'm not Argentinian.

¿Qué le vamos a hacer? What are we going to do about it? ¿Qué va a hacer? What is he/she going to do?

Yep. It was in a short story, and the author is Argentinian...?

Is that right written? If so, it depends on which country that "word" comes from