Come again?

My sister said this to me the other morning. I laughed and then I had to stop and think about it. I just came across the same quote while blog hopping, and again, I had to stop and think about it. I am still not too sure what this line really means, but I couldn't help but share. (If you hear me quoting it, it is only because I think it is the latest "trend" and I just want to sound cool. I probably will use it out of context, but hey, whatever works.)