Green’s Dictionary of Slang

Jap adj.

pertaining to Japan or Japanese lifestyle/culture.

[US]S.P. Boyer diary 15 May in Barnes Naval Surgeon (1963) 189: Saw Jap town by moonlight. [Ibid.] 13 June 201: Jap coal is worse than our bituminous coal at home.
Montgomery Ward Catalog n.p.: Ladies’ short silk waists, made of plain colored Habutai Jap silk [R].
[NZ]Otago Witness (NZ) 5 Aug. 52/5: [headline] The Jap Ear for Music.
[UK]Sporting Times 20 Jan. 2/4: The performance of a tiny Jap boy of the O’Kabe family of acrobats.
[US]‘Hugh McHugh’ You Can Search Me 47: I wanted to go through the parlour floor [...] and let a Jap shell knock my silly head off.
[US]E. Wittmann ‘Clipped Words’ in DN IV:ii 136: Jap, from Japanese. ‘This is a Jap kimono.’.
[US]C. Sandburg letter 9 Aug. in Mitgang (1968) 105: Thanks for the Jap book.
[US]F.S. Fitzgerald This Side of Paradise in Bodley Head Scott Fitzgerald III (1960) 162: We’ll get a Jap butler and dress for dinner and have wine on the table.
[US]O.O. McIntyre New York Day by Day 25 July [synd. col.] Two obsequious Jap servants were ministering to his wants.
[US]H.C. Witwer Yes Man’s Land 9: Lawns being sprinkled by Jap gardners.
[UK]E. Raymond Marsh 263: There’s nothing quite so beautiful as a ship coming up the river [...] A Jap she is, Dan boy. See the Rising Sun?
[US]C.R. Bond 18 Dec. in A Flying Tiger’s Diary (1984) 58: Kumming had been bombed this morning by ten Jap bombers.
[Aus]D. Stivens Courtship of Uncle Henry 25: Got his at Buna from a burst of Jap machine gun bullets through the left jaw.
[UK]K. Howard Small Time Crooks 19: Miky got a momentary picture of that full, soft body wrapped in a Jap silk kimono.
[UK]A. Sillitoe ‘The Disgrace of Jim Scarfedale’ Loneliness of the Long-Distance Runner (1960) 127: Forty-five if he looked a day, as if he’d just been let out of a Jap prisoner-of-war camp.
[US]H.S. Thompson letter 26 June in Proud Highway (1997) 621: I’d like to have BSA, Greeves and at least one smaller Jap bike.
[UK]G.F. Newman Sir, You Bastard 188: Snazzy Jap job.
[US]R. Price Blood Brothers 235: When they’d finished Tommy saw the bloodstains and said, ‘Hey! It’s a Jap flag!’.
[Aus]B. Humphries Traveller’s Tool 18: There’d be a lot more Jap restaurants in Los Angeles.
[UK]Indep. Rev. 7 June 7: Some carefully selected black Jap objets.
[NZ]A. Duff Jake’s Long Shadow 35: It’s a Jap import, the Nips’ discards for us bottom-of-the-heap Kiwis to buy at rip-off prices.

In compounds

Jap hash (n.) [chow mein, itself an ersatz form of Chinese food, invented for Western consumers, has nothing to do with Japanese cuisine]

(US) chow mein .

[US]Altoona Trib. (PA) 13 July 12/3: [headline] Chicken and Jap Hash Served to Pennsy General Supt.
Lansing State Jrnl (MN) 15 May 5/1: Buy a war bond / With spare cash / To get a bomb / To make Jap hash.
[US]Maledicta III:2 164: Jap hash n Chow mein or chop suey.
Jap moll (n.) (also Asian moll) [SE Asian + moll n. (2)]

(N.Z.) a prostitute who specializes in Asian or Japanese customers .

[Aus]Truth (Sydney) 19 Jan. 7: Those [i.e. prostitutes] who specialise in Japanese are called ‘Jap molls’, then there are ‘Asian molls’, Scannies, for those who go with Scandinavians.
[NZ]McGill Reed Dict. of N.Z. Sl. 13: Asian moll A prostitute who services Asian fishermen.
Jap scrap (n.)

(US campus) a motorcycle or appliance made in Japan, slightly derog.

Batimore Sun (MD) 4 May C19/2: [advert] Jap Scrap as usual all internal motor parts all makes.
[US]Times (Shreveport, LA) 21 June 21/5: If we don’t stop this Jap scrap from coming into our country, our country is doomed.
[US]Eble Campus Sl. Mar. 6: japscrap – motorcycle [...] made in Japan.
[UK]Indep. on Sun. Real Life 1 Aug. 1: Japanese bikes [...] The British bike owners call them ‘Jap Scrap’.