May also be pronounced, "Gayper." The term, "Gapper" is derived from people found on the ski hill that generally sport the dreaded helmet gap. The gap that exists between the brim of a ski helmet and the frame of the ski goggles. Generally these people don't seem to care that a very visible 2" gap exists exposing their forehead to the elements. As a result, "Gapper" can now generally be used to describe any skier that clearly has no sense of style or, fashion awareness.
"Hey man, check out all those gappers out on the bunny hill"
"Holy s**t, I have never seen a 3" gap before! That's the biggest gapper I've ever seen!!!"
"Damn eh, that gapper just cut me off in the lift line!"