Originally Posted by
Wasatch Phantom
Well, I guess I'm a tool as I've used the term.
It's part of the "Brevity code". It essentially means flying in reduced visibility or in and out of clouds.
Thus suppose ATC calls out traffic and you have the aircraft in sight but you know you'll lose the aircraft momentarily when you re enter the clouds.
I would guess you didn't fly in the military...
I'm trying to figure out how I've never even heard this before. I guess picking your nose in the cockpit and hiding the boogers in creative places is a full time job.