From The Original Sex Wiki
Lip slip: The malfunction of her clothes, especially her shorts or bikini bottom, leading to a good voyeuristic view or photo of her pussy lips. The moment of a lip slip is called oops situation.
Lip slip are common to happen at:
- Beaches and Pools: Especially at the end of the swimming season, bikini bottoms tend to be more lose. Lip slip occur most often when she stretches out for sunbathing and the crotch of her bottom or bikini panty is not as tight as she thinks.
- At places where women sit on stairs is summer wearing shorts, for example landmarks.