Double-talk is a form of speech in which inappropriate, invented, or nonsense words are used to give the appearance of knowledge and so confuse or amuse the audience.
Comedians who have used this as part of their act include Al Kelly,Cliff Nazarro,Danny Kaye,Gary Owens, Irwin Corey,Jackie Gleason, Jerry Lewis, Sid Caesar,Stanley Unwin,Reggie Watts, and Vanessa Bayer. 
... Al Kelly was synonymous with double-talk.
In the 1930s, "double-talk artists" enjoyed a brief craze in American show business. Comedians such as Jackie Gleason and the long-forgotten Cliff Nazarro and Al Kelly spouted nonsense words like "kopasetic", "franistan", "strismic" and "kravistate". Their double-talk was usually used to hoodwink a stooge and was delivered briskly, loudly and aggressively. Britain's Stanley Unwin, however, delivered his own brand of double-talk in the most benign way
Danny Kaye was a master at tongue-twisters, doubletalk, and dialects.
Some of Caesar's most popular bits were built around pompous or outlandish characters - such as Professor von Votsisnehm - in which he spoke in a thick accent or mimicked foreign languages in comic but convincing gibberish.
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