¿Qué significa I‘ll bite. ?

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@toystoryy Very difficult for me to explain. I'll try, since I would feel bad about not replying again.

Let's say someone is complaining about something.
Person A: No one ever asks me how I am doing! (Think of this like bait on a hook, like you are trying to catch a fish)

Person B: Okay, I'll bite. How are you doing? (I am a fish, I will take/bite the bait, and I will ask you how you are doing)

I really don't like my explanation. It's not a very common thing to say or hear, so I would not worry much about learning it. It's usually said when someone thinks that person A wants something, like for someone to ask them a question or something.