'Get down' can have various meanings like to lower oneself physically or to start dancing in a lively way. 'Pulp Fiction' is a famous movie. Maybe it could imply getting into the mood or groove related to the edgy, energetic feel of 'Pulp Fiction', perhaps like getting down to the funky or intense style presented in the movie.
The show 'The Get Down' isn't directly based on a specific true story. However, it incorporates various themes and scenarios that could be reminiscent of real-life experiences in certain communities and eras.