The next episode in the series of Glee. Not based on the Joan Jett song.
Bad Reputation is about the Glee Club finding songs that were so bad they were good in their time (MC Hammer is a good example) and singing it so they sound good, such as Physical and Ice Ice Baby.
Special guests were Olivia Newton-John and some other person who played an alcoholic and a druggy.
Also, apparently Will is a ****, and nobody is safe.