Firing on all cylinders

Work or function at a peak level of performance.

Work as expected, or at 100%

Teller: The lady tried to rob the bank using her fingers as a gun
Police: She doesn't seem to be firing on all cylinders

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Firing on all cylinders

To sneeze, poop, and urinate all at once on the toilet.

Dave: Man Paul, you in the bathroom for a long time.
Paul: Yeah, I was Firing on all cylinders.

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