The bar has gone through numerous incarnations over the course of its long lifespan. A network of underground tunnels made it a way station on the Underground Railroad. For a period prior to Prohibition, it was known as Moore's Beer Tavern; during Prohibition, it became Moore's Restaurant, then changed back to Moore's Beer Tavern once the 23rd Amendment allowed alcohol to flow freely again. (Prohibition reputedly did not stop the production of beer in the basement.) For a time, it was also a brothel, and some of the upstairs rooms have been decorated in the fashion of houses of ill repute.
One of the Slippery Noodle's more colorful claims to fame is its association with John Dillinger. The local gangster and his cronies were regulars at the bar and used the back wall for target practice. That wall is now part of one of the music rooms, and Dillinger's slugs--embedded in the brick--are still visible.
Perhaps not surprisingly, given the cast of characters who frequented the bar, there are also rumors of paranormal activity at the Slippery Noodle.