Someone who is in all ways attracted to both guys and girls. It is not because they are sex fanatics, or simply can't decide. Being bisexual is not a phase from people who haven't fully come out yet. It is as real as being straight or gay. You might have a preference over one sex, but bisexual means you can be attracted to both genders sexually, physically, and emotionally. In other words, you are fully capable of FALLING IN LOVE with them, just as a woman would fall in love with a man. It's not a circus freak thing.

A sexual orientation which refers to the aesthetic, romantic, and sexual desire for people of either gender. Often thought to cover the range between the two extremes of homosexuality and heterosexuality on the Kinsey scale. A bisexual is not necessarily attracted to both genders equally; they may very well be more attracted to one gender than the other.

Just remember, appearances can be deceiving. Someone you think looks straight may not be; likewise someone who to you looks gay, maybe bisexual. Don’t judge people.

someone who is atracted to both male and female

A bisexual is someone who loves another person physically, romantically, emotionally, and/or sexually, regardless of gender. They're not attention grabbers, greedy people, or people who can't make up their mind. They're not trying to disguise homosexuality. Some people think it's "cool" or "sexy" to be bisexual, but they're the kind of losers who have nothing better to do with their time other than to think of new ways to hopelessly and with futility get guys. There is nothing wrong with being bisexual, it's just like being heterosexual or homosexual, only you like both genders.

The ability to reach down someone's pants and be satisfied with whatever you find.

n.) A person who is attracted to both the male and female genders.

A person who likes men and women sexually, mentally, etc. Being Bi does not mean that a man is still "in the closet", or a girl wants attention by saying that she is Bi.