RichThesaurus
before you can say Jack Robinson
vs
like a blue-arsed fly
before you can say Jack Robinson
phrase
Very quickly; quicker than one expects.
like a blue-arsed fly
adj
To be frantic, harried or restless
How often have the words
before you can say Jack Robinson
and
like a blue-arsed fly
occurred in a corpus of books?
(source:
Google Ngram Viewer
)