Green’s Dictionary of Slang

Boche n.

also Bosche, Bosh, Bush
[post-WWI use is historical, f. Fr. caboche, head, or Alboche, a modification of Allemand, German; Fraser & Gibbons, Soldier & Sailor Words & Phrases (1925), suggest a root ‘about 1860, as low-class Parisian slang, meaning “bad lot”’; and that the transfer to a description of Germans came after the Franco-Prussian War of 1870–1 when the enemy was still ‘les Prussiens’]

1. a German, esp. a German soldier; thus Bocheland, Boschland, Germany.

[US]V. Chapman letter 26 Dec. in Letters from France (1917) 72: Xmas in the trenches was interesting but not too exciting. Beginning the eve before, ‘conversations’ in the form of calls. ‘Boches,’ ‘ça va’ etc. In response: ‘Bon camarade,’ ‘cigarettes,’ ‘nous boirons champagne à Paris,’ etc. Christmas morning a Russian up the line who spoke good German, wished them the greetings of the season, to which the Boches responded that [etc].
[US]J. McConnell letter 27 Sept. in Weeks (ed.) Greater Love Hath No Man (1939) 71: Last night we heard that 42,000 Bosches had been put hors de combat; that they were in full retreat and that our cavalry was right on their heels.
[UK]J. Buchan Greenmantle (1930) 135: We’ve got the measure of the old Boche now.
[Scot]Falkirk Herald 20 Dec. 2/1: Lately there were [...] throuighout Bocheland great popular rejoicings over the capture of Bucharest.
[US]Sun (NY) 25 June 38/2: There is not one of us here [...] who does not want to see Bocheland devastated from one end to the other.
[US]E. Wilson ‘Lieutenant Franklin’ A Prelude (1967) 243: That’s one compensation for living in Boche-land.
E. Genet War Letters letter 26 May n.p.: We’ve had our share of the shells of the ‘Bush’ too. The other day [...] swish-h-h, swish-h-h! two German 77’s came over our heads and struck a few hundred metres beyond.
[UK]Dagger [London] Dec. I 12/1: Sublimely unconscious of the attentions of Brother Boche.
[Aus]Sun. Times (Perth) 9 Mar. 7/3: He has grown to regard anything coming out of Boschland as questionable to say the very least, and extends his veto even to their lingo.
[Aus](con. WWI) A.G. Pretty Gloss. of Sl. [...] in the A.I.F. 1921–1924 (rev. t/s) n.p.: bosche. A German, especially soldier.
[US]C. McKay Home to Harlem 22: We was always on the defensive, as if the boches, as the froggies called them, was right down on us.
[Aus]X. Herbert Capricornia (1939) 117: When he saw old Fliegeltaub he hooted, ‘Bluidy awl’ Boche, wait’ll we get B’lin and see’t we do to bluidy awl Koyser’.
[UK]Lancs. Eve. Post 22 Oct. 4/2: If Hitler has his way, all Euope will be reduced to one uniform Bocheland, to be exploited, pillaged and bullied by Nazi gangsters.
[UK]C. Fluck ‘Bubbles’ of the Old Kent Road 42: In 1940 Hitler held a Brock’s [firework manufacturer] Benefit over London. [...] We took it and told the Bosh to go to Hell, where he belongs.
[US]D. Runyon Runyon à la Carte 200: Kindly do not refer to our people as krauts [...] Heinies, Boches.
[UK](con. WWII) G. Sire Deathmakers 99: ‘That’s right, for the sport, Captain,’ she said [...] ‘To kill Boches.’.
[US]H. Rawson Dict. of Invective (1991) 13: The French have long been reviled as frogs, the Germans as the Boche (cabbageheads) and as krauts (from sauerkraut).
[UK]J. Meades Empty Wigs (t/s) 603: [B]right young xenophobes alert to her accent, cut her or mocked her or deprecated her: Hun, Bosch, Kraut, Gerry.

2. attrib. use of sense 1.

[US]K.Y. Rockwell letter 15 May in War Letters (2008) 45: We took the Boche colonel prisoner, this was mentioned in the papers.
[Aus]R.H. Knyvett ‘Over There’ with the Australians 5: As the boche fire also stopped soon afterward, we were able to scurry back.