"To hit on" is a phrasal verb that means "to flirt with". So what she was asking was, "Are you flirting with me?" "To hit on" is very commonly used in both hetrosexual and homosexual situations. If it's litterally translated into English, it would be like this "Do you want to eat my tofu?" This has many connotations.

Are you hitting on me meaning?

If someone hits on you, they speak or behave in a way that shows they want to have a sexual relationship with you. [informal] She was hitting on me and I was surprised and flattered. [

What does it mean to hit on me?

Definition of 'hit on'

If someone hits on you, they speak or behave in a way that shows they want to have a sexual relationship with you. [informal] She was hitting on me and I was surprised and flattered. See full dictionary entry for hit. 'hit on'