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1.
SHOULD mean a person with a fear of pairs of items, but has come to mean the following:

a person with an irrational fear of bisexual people for which no straight person has ever had a solid reason. in this case, actions speak just as loudly as words.
"he broke up with her because she made out with one of her girlfriends. he must be a biphobe."
by bi sailor March 27, 2008
 
2.
A person who suffers from biphobia, an unreasoning fear of tandem bicycles.
Don't ride that tandem around to her house, she's a biphobe.
by The___Doug April 25, 2009