Japan 1990s—the extreme avoidance of social contact, especially by adolescent males; a person, typically an adolescent male, who avoids social contact—Japanese ‘hikikomori’ is the nominalised stem of the verb ‘hikikomoru’, meaning ‘to withdraw into seclusion’
USA, 1907—the (alleged) form of dementedness, leading to violence, that takes hold of a man who believes that his home has been invaded, or that his family has been violated—coined by attorney Delphin M. Delmas, who defended Harry K. Thaw in his first murder trial
USA, 1986—something intended to divert attention from something more important—refers to the fact that when two male gorillas confront each other, they throw dust in the air to distract one another—popularised, if not coined, by Henry Ross Perot
USA, 1942—over-ready to shoot at anything at any time or on slight provocation—during and following WWII, ‘happy’ was used as the second element in compound adjectives relating to mental instability associated with the first element
USA—1901 as ‘rocking-chair work’—1907 as ‘rocking-chair job’—a sinecure, i.e., an office or position providing an income or other advantage but requiring little or no work
U.S.A, 1932—also ‘the land of nuts and fruits’—a humorous, sometimes derogatory, appellation for the U.S. state of California—refers to California’s agricultural bounties and to Californians regarded as being ‘nuts’, i.e., crazy
UK, 1978—(soccer players) a confrontation that does not lead to serious fighting—based on the cliché ‘pistols at ten paces’—the substitution of ‘pistols’ with ‘handbags’, which evokes women fighting with their handbags, expresses the histrionic character of the confrontation
USA, 1975—to hastily or furtively leave a restaurant, cafe, etc., in order to avoid paying for one’s bill—also used as a noun, especially as a modifier—has also been used of meals eaten quickly
Australia, 1944—the customary bout of hasty drinking in public houses at the end of the working day, occasioned by the former six-o’clock-closing regulations