Best friend and I had a (drunken) heart to heart... yet what the hell does this mean?

If you care for her TALK to her. Really talk to her. Tell her that you value her and your friendship with her and that you don't want to jeopardize any of that. However, tell her how you feel about her. If you don't take a risk you'll never know what terrific things can happen. As a friend of mine always says, "If you don't ask, the answer is always "no."