What is mess up her lipstick?

"Mess up her lipstick" is a phrase often used in the context of kissing or intimate encounters. It refers to the idea that if someone kisses or makes out with a woman, they might end up "messing up" her lipstick, meaning smudging or wearing off the makeup. This phrase has become a cliche in popular culture and is often used in song lyrics, movies, and books. However, it's important to remember that the use of this phrase can be problematic as it reduces women to a superficial image and reinforces gender stereotypes about appearance.