of a person or thing: irretrievably defunct or out of date—UK, 1905—perhaps originally in allusion to ‘Diplodocus Carnegii’, named after Andrew Carnegie, who, that year, presented the skeleton of that diplodocus to the Natural History Museum of London
bag-in-box wine—South Africa, 1983—based on the contrast between ‘château’ (referring to expensive wines of superior quality) and ‘cardboard’ (referring to inexpensive bag-in-box wines)
to get excited, annoyed, angry—Australia, 1923—maybe based on the image of a person who, while riding a bicycle, gets provoked by another person: the cyclist would then dismount and respond to the provocator
an easy target, i.e., a person who, or thing that, is defenceless against an attack or other danger—first used in 1936 & 1937 by the Canadian journalist Gordon Sinclair
(chiefly humorous): a non-specific or hypothetical person, or a person whose name is unknown, forgotten or withheld—Australia, 1902—apparently an arbitrary formation
1945—originally referred to anti-fascist committees in Germany at the end of, and immediately after, World War II—from German ‘Antifa’, shortened from ‘Antifaschismus’ (i.e., anti-fascism) and from ‘antifaschistisch’ (i.e., anti-fascist)