Oh God, not the rolling eyes! It can mean many things:
1. Oh no, not again! 2. I can't believe you did that! 3. I can't believe you said that! 4. Give me a break! (not the leg, it's wooden and I like my termite friends) 5. That is the stupidest thing I ever heard. (Probably heard stupider but ya never know)
You get the idea, so enough said. Unless enough is not enough, but when is it enough. Oh hell, you get the idea!