I've often heard this term used in reference to bicycles or motorcycles. But motorists who pass lawful bicyclists without allowing a minimum of three feet space are lane-splitting, aren't they? And aren't motorists are supposed to slow down to a safe passing speed? What about illegal use of the horn, which happens every time a motorist honks out of irritation? Such antics can startle a bicyclist enough to cause a crash. And the, "rolling stop." I almost never see a motorist come to a complete stop, but bicyclists are blamed for this all the time (forget about the fact that not all bicyclists are expert at track-standing.) Don't forget that bicyclists very rarely are guilty of speeding!
Seems to me that bicyclists are often seen as lawbreakers, but motorists are actually just as guilty (if not more so.) Moreover,
if a bicyclist breaks a traffic rule (which I'm not advocating) he is mostly risking his own life, but a motorist who behaves dangerously towards a bicyclist (or anyone else, for that matter) is risking the lives of others.