He/she usually means that when you ask him/her if they want or need anything and they say that, they mean, "You know what I want, You know how I am."
It means I believe you. It could also mean I know who/how you are.
I know what I would mean, but the only way to know what HE means is by asking him.
When a teacher you know says hi to you it means they are being polite and acknowledging you.
he wants to know more
When the girl you told you liked says she doesn't know she is expressing she does not know if she likes you in the same way.
you know just shake it
He wants to know how you feel for him
He doesn't know what his emotions are at this point in the relationship
They mean that : You (yourself) does not know how much they love or like or care for you.
Don't know what you mean, change your question and I'll answer xx
It mean he is trying to let you know he likes you by complimenting you.
a