Frigo - (Soldiers' slang) Frozen or chilled meatHuff (Airman's slang) - to killandTo Lusitania - (slang) to torpedo (esp. a large passenger-ship)
All of these usages have disappeared I assume, though 'huffing' is still a term used in draughts (does anyone play draughts still?). The days are thankfully past when anyone would have occasion to 'Lusitania', and even gallows humour scarcely excuses it. But I did laugh out loud when I saw 'frigo' - definitely one for the slang counter at Iceland.
Cassell's also has an interesting definition for 'Archie' - actually 'Archies':
[nickname from the popular song, 'Archibald, certainly not',' with allusion to the fewness of the hits made], n.pl. (Soldiers' slang) Anti-aircraft guns or shells; the anti-aircraft force.
And in Collins' Etymological Dictionary (1922) there is:
Archies n.pl. the anti-aircraft force; also, the guns and shells. The name is said to have been given, owing to the fewness of the hits, from the song, "Archibald, certainly not."
Rather different from the version given by Ernest Weekley in his An Etymological Dictionary of Modern English (1921):
Archibald, Archie: “It was at once noticed at Brooklands [where much aviation development and testing was carried out prior to 1914, and portrayed in the film Those Magnificent Men in their Flying Machines] that in the vicinity of, or over, water or damp ground, there were disturbances in the air causing bumps or drops to these early pioneers. Some of these ‘remous’ were found to be permanent, one over the Wey river, and another at the corner of the aerodrome next to the sewage-farm. Youth being fond of giving proper names to inanimate objects, the bump near the sewage-farm was called by them Archibald. As subsequently, when war broke out, the effect of having shell bursting near an aeroplane was to produce a ‘remous’ reminding the Brookland trained pilots of their old friend Archibald, they called being shelled ‘being Archied’ for short. Any flying-man who trained at Brooklands before the war will confirm the above statement” (Col. C H Joubert de la Ferté, I M S ret.).