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1.
A person who's against people who like both genders.

They only approve of people who like one gender. This is somewhat different than homophobics. Bi-phobics dislike people who are attracted to both genders, while homophobics dislike men and women that are attracted to their own gender.
Alexander: Guys, I'd like to confess to all of you that I'm a bisexual.
Tony: You're a disgrace towards men! Men aren't supposed to be attracted to both genders, it's only right to be attracted to one, which is either man or woman.
Jenna: I strongly disagree with your opinion and I'm asking you to walk away. We don't approve of Bi-phobics in this area.
by HeyItsMarc August 19, 2011
 
2.
Someone who has feelings of disgust, fear, anger or hatred towards people who identify as bisexual. Some biphobic people are also homophobic and their reasons for their biphobic behaviour are the same as their reasons for their homophobic behaviour . Others accept and support homosexuality - or even are homersexual - yet are biphobic.
Some things/opinions people who are biphobic often say/have:
- You can only like one gender. Liking both is impossible.

- You're only saying you're bisexual, to get attention and if you're female it's too turn on guys with a lesbian fetish.

- You're just a gay person who doesn't want to come out.

- You're just being greedy. You only get to pick one gender. You can't like people from both.

- You're just a sex fiend who's only interested in having an orgy, threesome or sex with many different people. You're pretty much a slut.

- You're just going through a stage. You'll get over it.

- You're just confused and curious. Eventually you'll decide if you're straight or gay.

- Being bisexual is a choice. (Some biphobic people say homersexaul is and some don't. It depends if they're also homphobic)
by beingbisexual July 26, 2013