Of course there are those that think a gaper is defined by the gap between the helmet and goggles:
This of course is incorrect as it is merely a symptom of a much larger malady. The term gaper comes from the tendency of the neophyte to allow his chin to drag as he watches in awe, more accomplished skiers, whom we presume are not gapers. I am convinced that the term is on a sliding scale as I continue to experience the jaw slacking when I witness incredible feats of either daring or stupidity, leaving me to conclude that sometimes I is, and sometimes I isn't a gaper.
My last endeavor to exhibit gaperish behavior, was on a hike to Beaver at Alpine Meadows last spring with a bunch of maggots when I inadvertently carried my skis incorrectly on my shoulder in a way that the brakes did not interlock, thus leading to the much feared long and short ski (you better duck) head scissor.
In a terrible twist of irony, those most likely to be a "gaper" are the least likely to know what one is.
Remember that if people are clicking your picture, while at the resort base or in the lift line, it is unlikely because of your prowess and skiing radness, and more likely that you could be exhibiting the quintessential essence of gaper.