What does "good" mean anyway?

So apparently, every time I state that something (or someone) is good, several people feel the need to ask me to define "good."

I understand the moral, philosophical, relative implications of the concept, but do we really need to define "good" every time? For a very common word that most people use on a daily basis, one would think we have a somewhat common general concept of what one means by "good," however this is one of those concepts that people think deserve a "personal" definition.

So, what does "good" mean anyway?
I posted this discussion originally on Think Atheist, link bellow in case you are interested in reading the comments.
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