In the film O Brother Where Art Thou?, the Soggy Bottom Boys consist of: Ulysses Everett McGill (George Clooney) Delmar O'Donnell (Tim Blake Nelson) Pete (John Turturro) Tommy Johnson (Chris Thomas...
It's fictitious. In the movie O Brother, Where Art Thou? one of the characters invents the name when he and his friends record a song, "Man of Constant Sorrow."