It is just a joke with no real meaning. Mostly, tongue twisters are just for entertainment.
Slaphappy Sleuths was created in 1950.
The Sleuths - 1916 was released on: USA: 14 April 1916
Super Sleuths - 2006 is rated/received certificates of: Australia:M
India Detectives
The cast of Sleuths and Slickers - 1918 includes: Joe Rock
Sleuths and Slickers - 1918 was released on: USA: 1 April 1918
Slaphappy Sleuths - 1950 was released on: USA: 9 November 1950
Slick Sleuths - 1926 was released on: USA: 1 August 1926
The Young Sleuths - 1916 was released on: USA: 22 June 1916
The cast of The Sleuths - 1916 includes: Bobby Burns as Jabbs Walter Stull as Pokes
The Sleuths at the Floral Parade - 1913 was released on: USA: 6 March 1913
Slick Sleuths - 1926 is rated/received certificates of: USA:Approved (certificate not issued at release)