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

By Jorrie

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.

By Emeline

Define Firing On All Cylinders Meaning