Sorry, I didn't get the Mandarin part of your message. I have a hint about the word you are asking about. Don't use it. Not even to refer to a female dog (the actual definition), just say "female dog".

要特别特别特别好的朋友和哥们才可以用。一般情况下不要用，这个词太不好了

"bitch" 这个字比较难用。 你的例如用法应该是幽默的意思。你可以说：what's up, bitches?! 意思是朋友们，你们这么样？ 但是， 用这个字， 你应该需要认识那位人。不认识那位，我觉得不太合适。看情况吧， 如果你觉得合适，你可以用。

OK! got it, thank you~

My suggestion: Never use the word "bitch". It has no place in a proper English conversation and it is an insulting term. I hate to even hear people speak the word.