Green’s Dictionary of Slang

gap n.¹

1. the vagina.

1604		Middleton Black Book in Works VIII 34: I ordain lieutenant Prigbeard, archpander of England, my sole heir of all such lands, closes, and gaps as lie within the bounds of my gift.
c.1650		Le Strange Merry Passages and Jeasts No. 252 78: Sir William Spring having a wench in examination, upon a matter of Bastardie [...] she confesst it was gotten in Cunnigate way just at Cunston Gappe, a place well known in Suffolke.
a.1674		Rochester ‘The Argument’ Poems on Several Occasions (1680) 36: As oft as Finger, Dildoe, Pego, Rape, The Virgin Hymen, she repaires the Gap.
a.1749		Robertson of Struan ‘A Lady who was twice married, to Hymen’ Poems (1752) 84: O gracious Hymen! cure this dire Mishap, Sow up this mighty Rent, or fill the Gap.
1772		Bridges Burlesque Homer (3rd edn) 543: And made a gap as large and wide / As Madame ***’s.
1798		‘Medley’ in Hilaria 47: W— stood undismayed at old Q—’s queer mishap, / And swore, tho’ the devil should stand in the gap, / Into it he’d wriggle .
1867		Rosa Fielding 17: [G]getting his charger well in hand, he put his head straight for the gap.
1879		‘Lady Pokingham’ in Pearl 3 Sept. 21: The firey purple head of his cock looked like a large ruby, as [...] he presented it to her luscious-looking vermilion gap, the lips of which were just slightly open as she lay with her legs apart.
1888–94		‘Walter’ My Secret Life (1966) III 458: Such a delicious little gap it was, with the smallest possible quantity of golden hair just showing on it.
1892		‘Lais Lovecock’ Bagnio Misc. 13: His tongue tickled the pouting lips of her lascivious gap.
1893		‘Bob Sterling’ Town-Bull 47: ‘I have got a splendid, strong, young lover who fills the gap royally’.
1908		G.R. Bacchus Pleasure Bound ‘Afloat’ (1969) 131: [I] open my legs [...] and precisely what he does to the gap nature has left between them is his business.
1947–53		W. Guthrie Seeds of Man (1995) 251: I’m a-lookin’ fer another slick gap. Slippery Gap. It ain’t no covered waggin I’m a wantin’ ta skid in.
1985		O. Hawkins Chili 13: Big Time Seducer [...] full of oddball ethics. ‘Plug the Gap!’, ‘Go to daylight!’, ‘Pop through the note!’.
1992		R.C. Cruz Straight Outta Compton 75: Then, maybe, you wouldn’t have such a big gap between your legs, you sleazy Nigger-lover.
1993		Snoop Doggy Dogg ‘Ain’t No Fun’ 🎵 When I met you last night baby / Before you opened up your gap.

2. the mouth.

1915		M.G. Hayden ‘Terms Of Disparagement’ in DN IV:iii 199: gap, mouth. ‘Shut your gap’.
1934		Weseen Dict. Amer. Sl. 338: [General] Gap – the mouth.
1958		A. Sillitoe Sat. Night and Sun. Morning 108: Yo’ shut yer gap.
1965–70		in DARE.

In compounds

gap-stopper (n.)

1. a pimp or whoremaster.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.

2. the penis.

1890–1904

Farmer & Henley Sl. and Its Analogues.

In phrases

get the gap (v.)

(N.Z. prison) to have an opportunity.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 76/1: get the gap n. to have the opportunity.

In exclamations

stop your gap!

shut up! be quiet!

1937–84

Partridge DSUE (1984) 446/1: [...] late C.19–20.