It's uncommon compared to other similar expressions such as "You are out of your mind", but it's used and understood.

I wouldn't say it is extremely common, but it would certainly be understood by any native English speaker. :)

No, I don't think I've ever heard that. People would probably understand what you mean though.

“You are nine kinds of crazy” = not common, but understandable and stylistically fun, especially in joking or dramatic contexts. You can use it's alternatives like: “You’re crazy!” “You’re out of your mind.” “You’re insane.”

Thank you so much! I saw this expression in a Tv show :) That's why I was curious haha Glad to know!