Someone told me that in Russian slang, people ask each other: Kак дела? (How are you?), to which the obvious answer is Хорошо (Good).
But there's another word that starts with "x" and means the opposite (It may be a slur. I think it means "sh*t," but I can't remember the word), so when when someone asks you "как дела?", you can respond with the slang phrase: Буква Х (Letter X).
These are my questions:
Is this legitimate slang, and if so, is it correct? What's the other word that starts with "x" that means the opposite of "xорошо"?