"You're mine for the taking" is an old fashioned sentence spoken by a man in an old fashioned film or novel. It means that the man is very confident that he has the physical power to seduce the woman that he is saying this to.

Remember that "your" should be "you're". "Your mine" means someones mine.. a mine as in a "coal mine".

I agree with Jura, but will add on to that because this is not always used in conversation by a man of a woman. In the US in particular, this is used in "smack talk" or "trash talk" in sports, but still means that the person is very confident he has the ability to subdue the other person. It could also be used in a threatening sense where one person is threatening physical harm on the other person. I think this is the sense that is playfully meant in most smack talk. But also, be careful that the correct contraction is "you're mine" and not "your mine." A lot of us English speaker improperly interchange "you're" and "your." Spoken, they sound very similar in many accents, but they are not interchangeable. When they are written, it should be obvious which is used.

it means - i can have what i want :)

It means: I can have you whenever I want to.