When explaining the phrase "Netflix and chill" to your little sister, it's important to keep in mind her age and maturity level. The phrase has a double meaning, and its sexual connotation might not be appropriate for a younger audience. Instead, you can offer a simpler and innocent explanation.
You could say something like:
"Netflix and chill is a phrase that some people use to invite others over to watch movies or shows on Netflix and spend time together. It can mean just hanging out and watching something together without any other intentions. But some people use it to mean something more romantic or intimate, which is why it's essential to be careful with the context in which you hear it."
Remember to tailor your explanation to your sister's age and understanding, and encourage her to ask more questions if she's curious about anything else. It's always better to provide accurate and age-appropriate information while being a reliable source of knowledge for her.