Think of the condition of a loosely attached tarp covering a load on a trailer. The condition of the tarp after even a relatively short drive at highway speeds

Think of the condition of a loosely attached tarp covering a load on a trailer. The condition of the tarp after even a relatively short drive at highway speeds will be pretty rough (and the same for whatever it's beating into). This flapping around is called buffeting, or occasionally (much to my vicarious chagrin) "buffering" in motorcycle circles.