Green’s Dictionary of Slang

brown job n.2

[brown adj.2 (2) + job n.2 (2)]

1. (gay) anilingus.

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[US]E.E. Landy Underground Dict. (1972) 40: Brown Job n. Oral copulation of the anus.

2. (orig. UK milit.) a male homosexual.

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[UK]C. Wood Terrible Hard 57: ‘I don’t what no poufty officer being friendly with me,’ said Gray. ‘I reckon ’e’s a bloody brown job, creeping around with that pussy-arsed smile on ’is face’ [Simes:DLSS].