Vaudevillian Olsen is a term used to describe the comedic duo of brothers, Ole and Lars Olsen, who were popular in the early 20th century. They were known for their slapstick comedy and vaudeville-style performances. The brothers were born in Norway and moved to the United States in the late 1800s, where they began performing in vaudeville shows. They eventually became one of the most popular acts in the country, and their popularity spread to Europe and other parts of the world. They continued to perform until the 1940s, when they retired from show business.