gaper
n.— «Gapers garnered their nickname because, while standing somewhere they shouldn’t be, thus making them an accident-waiting-to-happen, the mouth tends to be agape.…The broader definition stretches further than just that of a once-a-year skier not knowing simple on-mountain etiquette.» —“You gotta deal with the gapers” by Nate Peterson Vaily Daily News (Colo.) Feb. 24, 2005. (source: Double-Tongued Dictionary)
Further reading
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