A person who has romantic interaction with, (but not all) males and females. They are not slutty, or attention whores, or greedy. They will leave you for a man, or leave you for a woman. In the end, does it matter? sexuality
Someone who has a romantic feeling towards both genders. No, they aren't confused. No, they don't like everyone they see. If you're a total asshole, they're not going to like you.
To have physical, sexual, and emotional attraction to both genders. It does not mean you're undecisive or that you're half gay and half straight. It most certainly does NOT make you're greedy. It just means that you have feelings for same and opposite genders.