A medical condition when one or both lips of a woman's labia turn in or out and/ or do not appear to work together. Though medically it is considered a matter of opinion, some say a lazy labia effect's one's ability to correctly judge the depth of the afflicted vagina. A popular layman’s description of a lazy labia is that the woman’s vagina appears to have suffered a stroke.
Person 1: Dude did you score with Hally last night?
Person 2: I had to hit that doggy style, seeing her lazy labia made it hard for me to keep a boner!