Jap

He petered out under Pitty's savage look: Do you speak Jap? Do you understand the world from inside those bastards' slanty-eyed little head-lopping poem-writing minds?

Source: wiktionary

He said it in Japanese, which surprised the boy and stunned Cullen. “You speak Jap?” asked Cullen. “Looks like it, doesn't it?”

Source: wiktionary

Among our Japs on board are two returning from Italy, where they have been with silk-worms' eggs, on cards, to sell. This has become a great speculation, and the Japs are going into it with zeal. The Japs almost always—always when they can—take cabin passages ; the Chinese seldom, or never.

Source: wiktionary

The Japs had been confident that this first and sudden land grab could be accomplished without their becoming involved in a major war, and they were right.

Source: wiktionary