UK, WWII, army slang—‘spud-bashing’ (noun): potato-peeling; ‘spud-bash’ (verb): to peel potatoes; ‘spud-basher’ (noun): one who peels potatoes—those words have also been used with reference to potato-digging
military slang, 1944—a medal awarded to all members of a force—especially the 1939-1945 Star, awarded to British service personnel who took part in WWII—refers to the ubiquitousness of Spam as a foodstuff
UK, 1920—an Arab man—‘Johnny’, a pet form of ‘John’, is used, with modifying word, to designate a person, especially a man, of the type, group, profession, etc., specified
USA, 1917—originally and chiefly military slang—an inspection of the penis for venereal disease or other infection—the image is of the penis as an additional, but shorter, limb
Australia—meaning: (as a verb) to rest or spend time in an aimless, idle way; (as a noun) an instance or period of resting—origin: Army slang, Second World War, from the notion of lying on one’s back
In reference to the names of various stretches of the Spanish Mediterranean coast which are popular with British holidaymakers, the Spanish noun ‘costa’ is used humorously as the first element in various invented place names.
Australian soldiers’ slang, 1917—literally: to fall heavily; figuratively: to suffer a failure or defeat—‘gutser’ (Scotland, 1901): originally denoted a belly flop—derived from ‘gut’ in the sense of the belly
USA, 1922—flappers’ slang: the sum of money that a flapper carried as a precaution so as not to be left financially helpless in case she and her boyfriend got ‘mad’ at each other while on a date