OK, I won't keep everyone on pins and needles.
When I was a test pilot in the military, many, many, many, many years ago, when an aircraft would depart from the design perameters for an unknown reason, or a system would shut down and start back up and we had no idea why, we would enter PFM in the flight log. As far as I know NASA still uses this terminology today.
pfm = pure f...ing magic
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