Is it time to start calling out bad cyclists?

It just means more than you would usually. I hate it too, but when you are in a hurry its certainly shorter than typing a sentence.

What's wrong with 100%? It already expresses the maximum degree to which a thing can be done, and it is already hyperbolic, since it is not humanly possible to give 100% of one's attention to any single task, even for a few seconds at a time.