a makeshift incendiary device for throwing by hand, consisting of a bottle filled with flammable liquid and with a piece of cloth as a fuse—Finland, 1940, in reference to Vyacheslav M. Molotov, who led the Soviet campaign against Finland
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
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)
Australia, 1906; New Zealand, 1918—a medic, paramedic or first-aid worker, especially when in attendance at a sporting event—from the proprietary name of a popular brand of antiseptic ointment
Australia, 1943, derogatory—a soldier who does not see active service, especially a reservist—from ‘cut lunch’, denoting a packed lunch, typically consisting of sandwiches