people who meet for a short time, by chance, and then do not see each other again—people who, although living together, are unable to see very much of each other—coined in 1873 by the U.S. poet Henry Wadsworth Longfellow
grim and ironical humour—UK, 1860, in reference to the practice of public executions—UK, 1870, as a loan translation from German ‘Galgenhumor’, in the context of the Franco-Prussian War
UK, 1929—a small camera for taking informal photographs of persons, usually without their knowledge—earlier occurrences (UK & USA, from 1907 to 1924) are often of unclear meaning
Australia, 1918—to get selected for a task, to gain recognition or approval, to succeed—the image is of getting selected in a sporting team (‘guernsey’: a shirt worn by soccer or rugby players)
in the phrases ‘(as) regular as pig tracks’ (1853) and ‘(as) common as pig tracks’ (1854), the plural noun ‘pig tracks’ is an intensifier—Southern United States
USA, 1859—humorous—the quality or condition of being a fish—from the prefix ‘pisci-’ (of, or relating to, fish) and the suffix ‘-ity’ (after the noun ‘humanity’)
U.S. College slang, 1985—the effects of alcohol thought of metaphorically as a pair of goggles that alter a person’s perceptions especially by making others appear more attractive than they actually are