Arsy-versy Definition
    adverb
  
 (idiomatic, UK, vulgar) Tumbling upside down; head over heels; backwards.
 Wiktionary 
Origin of Arsy-versy
-  
Alteration of arsa versa, a blend of an alteration of arse + vice versa, modeled on vicey versey
From Wiktionary
 
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