What is rut roh?

"Rut roh" is a catchphrase typically associated with the talking dog character named Scooby-Doo from the animated TV series, Scooby-Doo, Where Are You! The phrase has become popular and is often used to express confusion, alarm, or surprise. It first appeared in the show's pilot episode in 1969 and is often used when the gang encounters a potential threat or mystery. The origins of the catchphrase can be traced back to a line spoken by Jimmy Durante in the 1950s TV show, The Jimmy Durante Show.