There's no one-size-fits-all answer to this question, as the best way to leave a flirty comment will vary depending on the context and your relationship with the person you're flirting with. However, some general tips on how to leave a flirty comment might include being playful, making use of innuendo, or complimenting the person you're flirting with. Ultimately, it's important to gauge the situation and make sure that your flirty comments are appropriate and welcome before going too far.