Just curious if anyone has ever heard that term. I just heard it today i think for the first time.
What I had heard before is that you can be held partially at fault for an auto accident if you have a reasonable chance of avoiding it and didn't act.
That is what the "Last clear chance doctrine" refers to. In short, if someone else is about to cause an accident even if you have the right-of-way, and you do nothing to avoid it, then the accident is at least partly your fault.
With dash cams today recording your travel, location, speed, when you brake, etc., it may be easy to see whether or not you hit your horn, hit the brakes, tried to move out of the way, or any other attempt to avoid the accident. If you tried to avoid it at the "last clear chance," then you should not have to share in the blame.
Before dash cams were common, any eye witnesses on the scene told the investigators whether they saw or heard you doing anything to avoid the accident. Also, investigators will look for tire marks to show you hit the brakes even though anti-lock brakes might prevent that now.
The doctrine is apparently used in court to assign partial blame. In short, even if you're in the right by law, you can still be held liable for damages if you did nothing to try and avoid the accident.