What does it mean when a girl says your hair is long?

That your hair is long. It could me she likes it long, or that she thinks it is too long. Without knowing her, and not hearing her make that statement, there is no way for us to know if it means anything.

Next time a girl says something like that, you can take the opportunity to have a discussion. Ask her if she likes it long, or if she thinks it is too long. Or you can tell her you like it that way or that you just haven't had time to get it cut. Whatever the case may be.

That means, hey your hair is long.

Whether she liked it, disliked it, confused it, excited about it, shocked, questioned it surprisingly in statement manner!! And so many more expressions.

It depends where and how she said it, her tone clears this all.

That sounds like some sort of secret female code. They use it all of the time, just to confuse the males.

That your hair is too long.

Your hair is long.

I'm bald so it must be some some code.