It could be about various things. Maybe it's about a person having a bad hair day which is actually based on a real - life incident. It might involve a situation where someone's hair looked really awful in a true event and the story revolves around that, like perhaps a disastrous haircut before an important event in real life that led to some interesting or embarrassing consequences.
Perhaps it's a story where the 'bad hair' is a symbol for something that happened in a true story. For example, it could represent a difficult time in someone's life. Say, a character in the story was going through a tough phase like a break - up or a job loss, and their bad hair was a way to show their overall disheveled state, both physically and mentally, during that true - life situation.