barking mad

adjective
variants: or barking \ ˈbär-​kiŋ \

Definition of barking mad 

chiefly British, informal

: crazy, insane an eccentric personality that verged on barking mad— Mitchell Owens "Another one who thinks you're barking," said Ron, throwing a crumpled letter over his shoulder …— J. K. Rowling

First Known Use of barking mad

1933, in the meaning defined above

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