Just wanted to "confirm my hunch"

Question

Someone replied to me with: "Just wanted to confirm my hunch."

What is this expression usually used for?

Answer 1

In your example, hunch means a feeling that something is true or will happen, although you do not know any definite facts about it.*

So, in your example, it's about confirming his feeling/instinct about something.

From the Idioms section of Free Dictionary:

have a hunch (that something is the case) and have a hunch about something:

to have an idea about what did, will, or should happen; to have a feeling that something will or should happen.

I had a hunch that you would be here when I arrived. I have a hunch about the way things will happen.