Green’s Dictionary of Slang

1. (US) a ‘half-breed’, a person of mixed race; a person whose parents are of different religions.

1827		J.F. Cooper Prairie 45: The half-and-halfs that one meets in these distant districts are altogether more barbarous than the real savage.
1831		Morn. Chron. (London) 6 June 1/5: [US source] There was a wee bit of a piccanniny — a half-and-half — aboard with his mother.
1836		Chester Chron 30 Dec. 4/1: A Yankee malcontent [...] I don’t believe you’re a gentleman’ son [...] only one of your half-and-half .
1840		J.P. Kennedy Quodlibet 144: We shall get the custom of the [...] half-and-halfs [DA].
1851		G. Borrow Lavengro III 215: Though I keep company with gypsies, or, to speak more proper, half-and-halfs, I would have you to know that I come of Christian blood and parents.
1865		G.A. Sala My Diary in America I 133: Suddenly a ‘half-and-half’ French conductor put his head in at the car door, and exclaimed, ‘Dis is Point St. Charles.’.
1873		Sl. Dict. 185: The term half-and-half is also applied to the issue of marriages between gipsies and ‘white people’.
1941		K.S. Prichard ‘Marlene’ in Mann Coast to Coast 25: Being half-and-half, it’s a roof over her head Mrs Jackson wants.
1993		(con. 1945) S. McAughtry Touch and Go 27: She herself was a Half-and-Half. Her father was Catholic, her mother Protestant.

2. (US black) a hermaphrodite.

1935		Amer. Mercury (June) 229: Half-and-half: hermaphrodite.
1946		J.E. Dadswell Hey, Sucker 100: Half and half, a side-show performer who claims to be half woman, half man.
1967		in DARE.
2012		W. Keyser ‘Carny Lingo’ in http://goodmagic.com 🌐 Half-and-Half — A hermaphrodite, a very valuable blowoff attraction often forbidden by local authorities. Some were real freaks, others were ‘made’ by (at the least) shaving and making up one side of the body, or by the use of hormones to grow breasts so a performer born male could also display his upper ‘female’ half.

3. as offered by a prostitute, fellatio plus full intercourse; also as adv.

1937		‘Boxcar Bertha’ Sister of the Road (1975) 178: Nowadays few men want it straight. They want it half and half.
1961		R. Gover One Hundred Dollar Misunderstanding 21: Yoo-hoo, pritty baby, you wanna lil french? Haff an haff?
1975		J. Wambaugh Choirboys (1976) 226: She’s gonna say French or half and half.
1986–7		Maledicta IX 150: The original argot of prostitution includes some words and phrases which have gained wider currency and some which have not […] half and half (French plus ordinary intercourse).
1989		A. Vachss Hard Candy (1990) 109: You want something special, honey? A little half ’n’ half?
1990		S. Morgan Homeboy 199: Half n half five packs, short time onny two.

4. (Irish) a homosexual.

[1914		Sport (Adelaide) 9 Oct. 5/3: Why don’t Clarry G, Harry W and Clare S buy a skirt and blouse, and be real girls [...] — not half and half].
1969		P. Boyle All Looks Yellow to the Jaundiced Eye 52: Why else would he be taking up the cudgels on behalf of a crowd of bloody half-and halfs?

5. (US gay) a bisexual.

1972		B. Rodgers Queens’ Vernacular.
1975		G. Underwood ‘Razorback Sl.’ in AS L:1–2 60: half-and-half n Bisexual.

6. (US gay) fellatio plus anal intercourse.

1972

B. Rodgers Queens’ Vernacular 102: half-and-half [...] 2. (fr pros sl) sexual act of alternating cocksucking with fucking.