The origin of the nickname "Dirty Myrtle" is unclear, but there are several theories. Some suggest that it came from the city's seedy past, which included a thriving red-light district and gambling establishments. Others believe that it came from the high levels of pollution and litter that were present in the area before the city began its efforts to clean up the beaches and waterways. However, it's worth noting that in recent years, Myrtle Beach has undergone significant redevelopment and is now a family-friendly vacation destination with pristine beaches and a wide variety of attractions.