穴あな兄きょう弟だい

noun

men who have had sex with the same woman; hole brothers

Vulgar slang used among men to refer to other men who have slept with the same woman. The literal meaning is 'hole brothers'. Compare with 竿姉妹 (women who have slept with the same man).

See also: 竿姉妹

• あいつとは穴あな兄きょう弟だいだよ。

  He and I have slept with the same woman.

• まさかお前まえと穴あな兄きょう弟だいになるとは思おもわなかった。

  I never thought I'd end up being hole brothers with you.