round the twist

Definitions

Slang

  • adjective crazy, deranged. A racier version of the colloquial ‘round the bend’, this phrase moved from limited working-class usage to general currency in the 1960s.
  • adverb crazy, deranged. A racier version of the colloquial ‘round the bend’, this phrase moved from limited working-class usage to general currency in the 1960s.
http://www.dictionarycentral.com/definition/round-the-twist.html