1. The act of speaking unkindly about someone behind their back. (Bitching)
2. To describe someone to be bitch is usually people you
don't like. It means there super argumentative, quite
immature and there're usually two faced.
3. To use it for emphasis on the sentence. Generally used in a light hearted way. Only joking.
4. A female dog
5. Bitch fight. Where two girls argue about something so
pretentious it's laughable.