Green’s Dictionary of Slang

1. a woman who has had intercourse with one man and is about to repeat this immediately with a new partner; thus butter someone’s bun, to be the first in a series of consecutive lovers; have/do the buttered bun, of a man, to take second place in a bout of serial intercourse.

1640		Cyprian Conqueror 25: [The maid] preserves a bit for her young master, who doth hit On Butter bunn, rather than meale will want.
1652		Mercurius Democritus 22-29 Dec. 300: One of his Journey-men [...] finding the next morning his Halfpeny loaf to prove a Butter’d Bun .
1694		Comforts of Whoreing 9: [She] begins to smell a butter’d Bun preparing for her Master’s Supper.
c.1698		B.E. Dict. Canting Crew n.p.: Butter’d bun, Lying with a Woman that has been just Layn with by another Man.
1714		N. Ward Miseries of Whoring 156: Mistress Betty by command is set / To make a pot of curious Chocolet / Which makes her smell there’s something to be done, A good Horn-Cap, or else a butter’d Bun, Against her Master’s coming home at Night? [...] And on the Butler she does cast her eyes, In whose Embraces her Pleasure lies.
1723		C. Walker Authentick Memoirs of Sally Salisbury 103: I was Sot enough to stay and be content [...] with a Butter’d-Bun, and her dissembling Cant.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict.
1772		Bridges Burlesque Homer (3rd edn) 377: Must atreus’ sons all wenches seize, / And trim ’em when and where they please, / Whilst we, who all their prizes won, / Must thank ’em for a butter’d bun?
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: buttered bun, one lying with a woman that has just lain with another man, is said to have a buttered bun.
1798		‘The bankrupt Bawd’ in Hilaria 36: Some butter’d buns conceal’d within, / Old Q.’s keen eye beset, sir .
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1842		Wkly Rake (NY) 18 June n.p.: the rake advises [...] Jeweller Jim [...] to remember that ‘buttered buns are sometimes burnt’.
c.1850		Peeping Tom (London) 9 35/3: No sooner had the valet finished [...] than master [...] saluted his partner [...] Thus a buttered bun, which would be too rich for a delicate stomach.
1867		Rosa Fielding 59: ‘[I]in half-an-hour’s time, if I have any luck, you may have either a buttered muffin or bun if you like!’.
1879		‘Characters of Husbands’ in Pearl 6 Dec. 26: If a husband came home and found his wife being had by another man, what would he do? [...] The Good-Natured husband would remark that he liked buttered buns.
1889		C. Deveureux Venus in India II 124: I’ll go with you, but if your friend likes I’ll go to him, or he can come to me when you are done. Buttered Buns! said my friend laughing.
1896		Farmer Vocabula Amatoria (1966) 21: avaler les enfants des autres = to act as fellator to a woman fresh from the embrace of another man; ‘to gamahuche a buttered bun’. [Ibid.] 112: essuyer les spermes. To embrace a woman after others have enjoyed her person; ‘to do a buttered bun’.
1899		Crissie 15: It wouldn’t be fair neither to your old man [...] if I buttered your bun before he’s first had a go at it to-night’.
c.1904		A. Crowley Snowdrops from a Curate’s Garden 22: She shot off my well-oiled plenipo and was immediately split up from the fork to the shoulders by the giant callibistris of Lord R...y, whose affection for a buttered bun is only equalled by the size of his Julius Caesar.
1967		‘Whisper All Aussie Dictionary’ in Kings Cross Whisper (Sydney) xxxii 7/1: buttered bun: A female who shows her favours to many men within a short amount of time. Usually nymphomaniacs. Or friendly (overfriendly) females.
1972		R.A. Wilson Playboy’s Book of Forbidden Words 57: Buttered Bun. A prostitute who has serviced several customers in a row.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 19: Buttered Bun Group Sex.
1986–7		Maledicta IX 149: The compilers ought to have looked farther afield and found: [...] privateer (part-time pro, the Navy also supplying contrasting terms such as buttered buns or wet deck).

2. a mistress, a prostitute.

1673		‘Letter from a Missionary Bawd’ in Carpenter Verse in English from Tudor & Stuart Eng. (2003) 425: For since it must or here or there be done, / He swears hee’ll have a wholesome butter’d bun.
1675		T. Duffet Psyche Debauch’d I 400: Go somewhere else, and make your greazy puns, I love no butter’d Fish, nor butter’d buns.
1680		‘A Ballad of Sir Robert Peyton’ in Lord Poems on Affairs of State (1965) II 310: A French butter’d bun of bawdy Whitehall.
1700		T. Brown Amusements Serious and Comical in Works (1744) III 68: The Doctor does not love butter’d buns, doubtless he is glad his first lady-wife is under ground, for he married again within two months after her death.
1772		Bridges Burlesque Homer (3rd edn) 180: Two pretty lads, old Priam’s sons, / Both very fond of butter’d buns.
1879		London Life 9 Aug. 5/1: [T]hey responded rather tartly : ‘We go to Chelsea for , our buns, where we get them buttered’.