Green’s Dictionary of Slang

1. to stimulate the vagina with one’s fingers; occas. of the anus.

c.1682		‘Scandall Satyr’d’ Harleian Mss. 6913.211: [She] may wish she had thought better on’t, When she lett Mullgrave fingerfuck her Cunt.
1715		‘Nickydemus Ninnyhammer’ Homer in a nut-shell 64: Then look’d for Nelly; in a Garret / She found her f-gg-g with a Carrot; / With many a Finger-f-k-g Neighbour,/ All groping, just as at a Labour.
a.1796		‘Green Grow the Rashes’ in Farmer Merry Songs and Ballads (1897) I 261: She maws like reek thro’ a’ the week, / But finger-fucks on Sunday, O.
c.1800		‘There was a Pious Parson’ in Burns Merry Muses of Caledonia (1843) 75: He finger f— the furies, / He bollock’d the bitches.
1882		Cremorne II 55: Finger fucking and all that may be a bit in your line, Mr Jack.
1896		Farmer Vocabula Amatoria (1966) 139: Foutre en main = to masturbate; ‘to frig’ or ‘finger-fuck’.
c.1915		in P. Smith Letter from My Father (1978) 63: One of the women that I finger-fucked in the subway was a model.
1926		in E. Cray Erotic Muse (1992) 142: When she reached the hop-joint / And she looked in the window so high, / There she saw Johnnie a-sittin’, / Finger-fuckin’ Nelly Bly.
1931		in Randolph & Legman Ozark Folksongs and Folklore (1992) I 482: Supplied [...] in 1931, by the hobo-song specialist, Godfrey Irwin, who stated he heard it ‘on a ranch near Boise, Idaho, between 1910-12’ [...] ‘There sat her lovin’ Johnny-boy / Finger-fuckin’ Alice Fry.’.
a.1940		in E. Cray Erotic Muse (1992) 139: She ran along Fish Alley, / Looked in a window so high, / Saw her lovin’ Johnny / Finger-fucking Alice Bly.
1957		in Randolph & Legman Ozark Folksongs and Folklore (1992) I 481: Johnny was setting under the counter / Finger-fucking Nellie Blythe.
1967		I. Rosenthal Sheeper 88: roy’s wife: He made it with other women. sheeper: He finger-fucked them.
1972		B. Rodgers Queens’ Vernacular 80: finger-fuck to ease the middle finger into the rectum and move it in and out in sham coitus; usually done simultaneously with sucking cock.
1986		B. Geldof Is That It? 37: I did. I fucking did. I fucking finger fucked her.
1998		I. Welsh Filth 98: I finger-fuck her roughly and get her to suck me off.
2000		‘tifmadken’ ‘Jenny’s Work’ 🌐 25 Dec. He put one of his strong fingers in her wet pussy and pumped her with it. Jenny could feel his cum sloshing around inside her. She thought that it must feel gross to him. She moaned and said nothing as he finger fucked her.

2. of a woman, to masturbate.

1965		in Guild Dict. Homosexual Terms.
1988		‘Victoria Parker’ Incest Schoolgirls 🌐 Both young girls were finger-fucking frantically now, lost in the heat and pleasure of their masturbatory action.
2001		‘Hornypig10’ ‘Just a Bastard’ 🌐 I had come just minutes before watching my little sister finger fuck her own pussy.

3. (S.Afr. prison) to make an anal examination.

2005

A. Lovejoy Acid Alex 208: Usually they don’t fingerfuck you, so you bottle the biggest poke of snout and newspaper you can.