This quote is a compliment and a boost of confidence. When someone says, "Girl, you are a badass," they're telling you that you're really awesome and capable. It's like giving you a big thumbs-up for your strength and awesomeness.
Being a "badass" means you're not afraid to take on challenges, and you face them with courage and determination. It's a way of saying that you're strong, confident, and you can handle whatever comes your way.
So, when someone tells you this, they're celebrating your fantastic qualities and letting you know that you're remarkable just the way you are. It's like a high-five for being an awesome person!