What is a good age for kids to watch entertaining but slightly inappropriate tv without mimicking it?

I was watching the Grim Adventures of Billy & Mandy, and they were discussing diarrhea, I laughed off. There was also a part where grim said "don't make stick that right up you" and someone else interrupted in that moment saying "as I was saying" (actually making it sound like "right up your ***") For a small kid to see it I would think it's completely inappropriate, however the show is hilarious something very entertaining, what age would be good to laugh at it but not pretend play to be them, or repeat quotes, or just know it's wrong and just a show?