Some woman was looking for you

I saw the followings in a grammar book:

'Some' can be used with singular count nouns:

Some woman was looking for you.
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What does 'some woman' mean in the above sentence? Why don't we use 'a woman'?

"We can use this structure to suggest that we are not interested in somebody or something, or that we do not think much of him/her.it." Swan, Practical English Usage, OUP.

Which grammar book did you use? Did it give no explanation?

5jj said:

"We can use this structure to suggest that we are not interested in somebody or something, or that we do not think much of him/her.it." Swan, Practical English Usage, OUP.

Which grammar book did you use? Did it give no explanation?

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Thanks, 5jj.

English Grammar
A resource book for students by Roger Berry

Some woman was looking for you.

Here it is not a quantifier referring to a vague or unknown number or quantity, but indicating an unknown individual.

Winwin2011 said:

Some woman was looking for you.

Here it is not a quantifier referring to a vague or unknown number or quantity, but indicating an unknown individual.

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Exactly.

On my walk today, I saw some guy with the cutest dog I've ever seen. But I was too shy to speak to him.

You can also use "I saw this guy" when you're informally telling a story (in American English). It's an odd use of "this" because he's not in front of us as wel tell it, but he's in the front of your mind when you think of it.