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quicker than you can say Jack Robinson

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quicker than you can say Jack Robinson

Extremely quickly; almost immediately; suddenly or in a very short space of time. Once I'm finished with high school, I'll be outta this two-bit town quicker than you can say Jack Robinson! I was out fishing one day when, quicker than you can say Jack Robinson, a 20-pound trout jumped out of the water and right into my lap!

See also: can, jack, quicker, Robinson, say