making noise mean

[shinem]

“You know I’ve had a name rattling around in my head?”
“Is that what makes the noise?”
“I’ll ignore that."

I couldn't understand the last two sentences. Is it an idiom?

[5jj]

“You know I’ve had a name rattling around in my head?”
“Is that what makes the noise?”
“I’ll ignore that."

I couldn't understand the last two sentences. Is it an idiom?

No. The second speaker is jokingly suggesting that a noise is coming from the first speaker's head. The first speaker understands the humour, but says that s/he is not going to be drawn into defending his/her original choice of words.

[shinem]

Thank you very much that is clear now for me :)