It is just a joke with no real meaning. Mostly, tongue twisters are just for entertainment.
This tongue twister is a fun sentence that plays with alliteration and rhyme. It does not have a specific meaning or reference. It is designed to be challenging to say quickly due to the similar sounds and stringing together of words with repetitive consonant sounds.
As I am the creator of this tongue twister, I can give some background on it. I was living in Germany and watched a very funny skit on a comedy show “Loriot” of a German news anchor woman (played by Evelyn Hamann) trying to read a story about some British people. She was getting all tongue-tied from the “th” sounds which Germans have a hard time with. So I decided to create my own monster of “th” sounds especially to confound the Germans. The twister has no real meaning, but it is not total nonsense either. The transitions between “th” and “s” are very difficult even in English.
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
Β India Detectives
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
Sleuths and Slickers - 1918 was released on: USA: 1 April 1918
The cast of Sleuths and Slickers - 1918 includes: Joe Rock
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)
The cast of The Sleuths - 1916 includes: Bobby Burns as Jabbs Walter Stull as Pokes