Green’s Dictionary of Slang

(US) a ‘red-light’ area.

1959

W. Brown Teen-Age Mafia 116: A flea-bag on skid row or a cathouse in slicetown.

1. to have sexual intercourse.

1772		Bridges Burlesque Homer (3rd edn) 186: Mindful of the many slices / She got on Ida with Anchiases.
1797		Bridges Burlesque Homer (4th edn) I 253: [as cit. 1772].
1984		Partridge DSUE (8th edn) 186/1: carve a slice To copulate (from the male point of view) Cockneys; C.20.

2. to take a portion of the profits.

2000		Guardian 27 Jun. 🌐 If you think starting work is the beginning of the end, or feel jaded in your job, take advantage of free advice on how to carve a slice of the future for yourself from those making it happen.
2023		A. Nette Orphan Road 92: ‘Don’t get me wrong, Gary. I don’t want a slice. This one is for old times’ sake, you know, for Vera’.

of a man, to have sexual intercourse, esp. with a married woman, since proverbially ‘a slice off a cut loaf is never missed’.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Slice To take a slice; to intrigue, particularly with a married woman, because a slice off a cut loaf is not missed.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
[1835		‘The Bamboozling Barber’ in Cove in Spedding & Watt (eds) Bawdy Songbooks (2011) IV 229: ’Tis pity that beauty with bad age, / Shou’d submit to be fondled and kiss’d, / And ‘a slice’ now you know the old adage, / ‘From a cut loaf can never be miss’d].
1836		‘Jack’s Jobs’ in New Cockalorum Songster in Spedding & Watt (eds) Bawdy Songbooks (2011) II 20: He then went to the cook, / With her to have a slice, / And she so charmingly did look, / Her meat it look’d so nice.
1839		Crim.-Con. Gaz. 17 Aug. 263/1: ‘I’ll [...] go home to Lady Brougham and take a slice ob her cold mutton’.
c.1864		‘The Mysteries of London’ in Rakish Rhymer (1917) 25: Then you walk to the market with your wife for a treat, / And see some old butcher exposing his meat, / She thinks the joint heavy, when he tells her blunt, / He’ll cut, if she pleases, a lump of the coun — / Try fed pork.
1939		J. Weidman What’s In It For Me? 38: I’ll just give you a couple of slices off my own loaf.
c.1949		in E. Cray Erotic Muse (1992) 184: Now she lies beneath the sod; / Her soul, they say, is gone to God, / But down in Hell, when Satan’s blue, / He takes a slice of the ring-dang-doo.
1977		S. Berkoff East in Decadence and Other Plays (1985) 61: Our lad’s a lad, and sown his wild then has he and did you cut yourself a slice.
1980		J. McClure Spike Island (1981) 96: We also pick up [...] who’s knockin’ a slice off somebody’s wife.
1998		(con. 1986) G. Pelecanos Sweet Forever 96: You see that little piece of ass hangin’ on Alan Rogers’s arm? Wouldn’t mind cuttin’ a slice of that myself.

see piece of cake under piece n.

(Irish) an act of sexual intercourse.

1965

L. Dunne Goodbye to The Hill (1966) 78: He looked more like an oul’ fella who’d rather have a cup of sugary tea than a slice off the legs.

the vagina.

1983

R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].

(Aus.) to commit adultery.

1967

‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xli 4/2: take a slice from a cut cake: Commit adultery.