Green’s Dictionary of Slang

backgammon n.

[pun on SE + SE gammon, the bottom piece of a flitch of bacon, including the hind leg]

In compounds

In phrases

play backgammon (v.)

to have hetero- or homosexual anal intercourse.

[UK]R. Brome New Academy IV i: And when we are marri’d, I’le make her stick to’t before my face, I warrant you; or if she will make back-play, I’le play at nothing but back gammon with her.
[UK]Parliament of Women B4: Mistris Dorcas Doe-little [...] saith she, my husband is a Gamester and [...] when he hath been all the day at passage and hazard, at night he comes home and playes with me at Doublets, Baramel-ace and backegammon .
[Ire]‘Irish Hudibras’ in A. Carpenter Verse in Eng in 18C Ireland (1998) 44: The Priests that Lodge upon this Common, / Do play at Irish and Bac-Gammon.
[UK]T. Brown Amusements Serious and Comical in Works (1744) III 25: The Devil’s broker [...] on that day, he employs in adjusting his accounts, and playing at back-gammon with his principal.
[UK]The only True LIST, of those celebrated SPORTING LADIES [broadsheet] Particular care will be taken that no one plays at Backgammon; if any body be detected at that sport, he will be tried by a Jury of Women and [...] dismembered by the Ladies present.
[UK]‘A Game at All Fours’ in Convivialist in Spedding & Watt (eds) Bawdy Songbooks (2011) IV 20: Some there who, I wish, were hung as high as hammon, / Are fond I am told of the vile game Back-gammon.
[US]Murray & Murrell Lang. Sadomasochism (1989) 34: backgammon n. Greek* especially done repeatedly and furiously. ‘wanted: Young lady for backgammon, French lessons, light SM’ [personal ad, restroom wall, OSU main library, 3/10/87] [...] backgammon player n. phr. [...] Person who especially enjoys backgammon* ‘Backgammon players need have no experience, will train, but must be enthusiastic about the game’ [personal ad, restroom wall, OSU main library, 3/10/87].