another expression for "you're kidding me"; when someone says something that you dont believe, you usually say "you're shitting me"
Me: I personally know George Clooney.
You: You're shitting me rightt?
when you're on your cell after 9 or 7 (when its free) and the person you're talking to is wasting your time with their stupidity
Person: Brittany Spears is my role model.
You: You're wasting my free minutes, you know that?