Try to pronounce it correctly, BYE-FUR-KAY-SHUN. Or BEH-FER-KA-SHIN. Depends on you.

Anyways, this is committed when two propositions are presented as if they we mutually exclusive and the only two possibilities, when in fact they are not.

For example: "Either the light is red or green." This commits the fallacy of bifurcation because there is another possibility, maybe the light is yellow.

Another example would be: "Either creationists are ignorant or they're lying." This commits the fallacy of bifurcation because there is another possibility, maybe the atheist is ignorant!

There's not much to say about this one, yet it's committed a lot, it's almost like lying. It's just not telling the whole story.