When a group of close or loosly connected friends decide they have had enough off putting up with a person of extrordinary bitchness. Preceeding a Bitch Hunt, many events may of happened over previous years between the "bitch" and the "mob". The bitch hunt is the last straw and breaks the camel's back. The "Mob" of a Bitch Hunt hath the highest agression. The "Bitch" is not to be trusted and is expected to be a compulsive liar.
The mob was so fed up with the bitch that after three years of her crap, they all formed a Bitch Hunt and took her down.