Can I tell an embarrassing story about my girlfriend?
Why do you want to tell an embarrassing story about her to someone else?
I just want people to know that she is just a fucked up bitch!
While it is understandable that you might be get upset at your girlfriend from time to time, it isn't right to tell embarrassing stories about as revenge. It's also concerning that you use foul terms such as "bitch" when you describe your girlfriend. People in relationships should treat each other with respect and if you are having difficulty in doing that you should learn better ways to deal with your anger rather than call your girlfriend names.
You are overreacting, . She's a piece of shit and I can say whatever I want about her.
It is expected that you treat your partner with respect. If you act like this she will likely break up with you.