If you say that something is neither here nor there, you mean that it does not matter because it is not a relevant point.

For example:

Whether or not I agree with you is neither here nor there.

Your comment, though interesting, is neither here nor there.

Her age is neither here nor there — the real question is, can she do the job?

It’s essential that she has this medication, and the cost is neither here nor there.

I’m not interested in her opinion on this matter. Her views are neither here nor there to me.

Tradução: irrelevante.