Wikipedia
Hoop-Dee-Doo
"Hoop-Dee-Doo" is a popular song published in 1950 with music by Milton De Lugg and lyrics by Frank Loesser.
The lyrics of this song are sometimes cited for their use of the phrase "soup and fish", meaning a man's formal dinner suit. This phrase is commonly thought to have originated with P.G. Wodehouse's " Bertie Wooster" stories, but according to the website World Wide Words, it was an even earlier American usage.