困境;一团糟;棘手的情况 If you describe a situation as a bitch, you mean that it is very unpleasant or difficult to deal with.
VERB 抱怨;发牢骚 If you say that someone is bitching about something, you mean that you disapprove of the fact that they are complaining about it in an unpleasant way.
They're forever bitching about everybody else. 他们永远都在怨别人。