This phrase or something similar maybe isn't as lame or dumb as it seems, and applies when we are on our bikes, not just something the cagers will ignore.
Last Friday I was on a lake ferry in British Columbia and all 5 bikes on the boat got slotted together. With only a little conversation we learned that three liked to "push the envelope," and it turned out on the road the Goldwing rider was only slightly faster than me.
Those "push the envelope" guys made very quick passes on double yellow lines where they could not possibly see over the crest of the hill. True, they didn't move out very far into the oncoming lane, but it could have been an accident for a quick motorcyclist coming the opposite direction in the left wheel track on this narrow road if the timing had been just right. We all were stopped for 15 minutes not far up the road, Goldwing and I together, fast guys two cagers ahead because of rock fall being cleared. Then the road crew moved all the bikes to the head of the line. So we got to watch them do it again.
There are a lot of these guys, good experienced riders, but they are dicing with your life. I'm not sure what the moral is. On blind uphills, I move to the center of the lane or even right of center to give these possible threats more room. And I slow down a bit if I think there is a possibility of a crossroad vehicle also coming onto the road near the crest.
I still occasionally ride very quickly, but I try to pick spots where that is not likely to do me or anybody else any harm.
Somebody else said it far more eloquently, but I try to respond to the "possible" threat rather than have to take emergency action for the one in my face.