Do you ever feel like a wage slave?
Totally. Wage slavery has a lot of negative connotations, drawing lines between wage labor and slavery. 
I consider one a wage slave when you are not paid enough to live on
Due to the flexible nature of what "needs"means, funnily enough there isn't any universally accepted measure of a living wage?
I think I would define it as decent basic housing, healthy food, basic clothing, medical care as needed and transportation
That reminds me of food deserts. That's where some people of low-income status don't actually live near enough to places where they can even access healthy food, sadly.