Aspects of this topic are discussed in the following places at Britannica.
...of “backward speech” (which have as their primary purpose the concealment of messages) have been reported for adolescents. Such phenomena are functionally not unlike English pig Latin. Iban of northwestern Borneo shows an unusually large number of words with what appear to be reversals of the meanings found in cognates in other languages. This, too, may reflect an earlier tradition...
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