• noun a hideous or repellent person. A phrase from the vocabulary of Valley Girls and other American teenagers from the mid-1970s, probably originating in earlier surfers’ slang. The image evoked is of a person who must wear a bag over their head – and provide one for the onlooker too, or alternatively wear two bags. The expression, in this humorous usage, was first borrowed from the language of baseball, where it describes a hit which allows the hitter to advance two bases or ‘bags’.