Green’s Dictionary of Slang

twang v.1

also twangle
[? SE twang, to fire an arrow; note D’Urfey, Pills to Purge Melancholy (1719): ‘Twangdillo, A New Ballad’, which deals with the many female pursuers of one ‘Roger Twangdillo’]

to engage in spontaneous sexual intercourse.

[UK]Udall Ralph Roister Doister II i: Then up to our lute at midnight, twangledom twang. / The twang with our sonnets, and twang with our dumps, / And heigho from our heart, as heavy as lead-lumps.
[UK]Beaumont & Fletcher Beggar’s Bush III iv: Twang dells i’ th’ strommel, and let the Quire Cuffin / And Harman Becks trine and trine to the ruffin.
[UK]Middleton Game at Chess II i: Yet there’s no eminent trader deals in hole-sale But she and I have clapped a bargain up, Let in at watergate, for which I’ve racked My tenant’s purse-strings that they’ve twanged again.
[UK]Parliament of Women B4: The chiefe heads of the womens Lawe […] That women may twang it as well as their husbands.
[UK] ‘The Rump serv’d in with a Grand Sallet’ Rump Poems and Songs (1662) II 121: Fit Jakes-farmers for the Rump, they could twang and nose it.
[UK] ‘Jolly Roger Twangdillo’ in Wit’s Cabinet 158: Jolly Roger Twangdillo of Plowden Hill.
[UK]‘Phoebe Crackenthorpe’ Female Tatler (1992) (41) 94: The Duchess of Twangdillo.
[Ire] ‘The Wee Wee Bag of Potatoes’ Chap Book Songs 5: Oh how he batter’d her [...] how he twangled her, with his Wee Wee Bag of Potatoes.
[UK]J. Bell Jr. (ed.) Rhymes of Northern Bards 20: The bow and the dart, that occasion’d her smart, / Squire Cupid may twang.
[US]Maledicta IV:2 (Winter) 197: There are various semi-technical terms for acting thus, such as grind, screw, twang.
[US]R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].
[Ire]Share Slanguage.

In phrases

as good as ever twanged

1. as good as possible, in any context.

[UK]S. Gosson School of Abuse (1868) 24: His skill is showne too make his Scholar as good as euer twangde shoulde.
[UK]J. Taylor ‘Taylors Penniless Pilgrimage’ in Works (1869) I 123: In Barbican, / There’s as good Beer and Ale as euer twang’d.
[UK] ‘The Bloody Bed-roll’ Rump Poems and Songs (1662) I 346: Next comes Sir Henry Mildmay / As good as ever twang’d.

2. of the male genitals, in prime condition, esp. in the sexual context.

[UK] ‘Unfortunate Jack’ in R. Thompson Pepys’ Penny Merriments (1976) 227: [of the male genitals] My marking irons ... as good as ere did twang.

3. of women, as good as one might wish, esp. in the sexual context.

[UK]N. Breton Pasquil’s Madcappe in Grosart (1879) I 9: She may hap prooue as good as euer twangd.
[Ire]Head Nugae Venales 251: She had a Daughter which was more Handsom than Honest, and much more Witty than Wife, in short, both Mother and Daughter were as right as my Leg, and as good as ever twang’d.
[UK] in D’Urfey Pills to Purge Melancholy V 69: Unto these two Couple come long sided Sue, / Is as good as e’er twang’d, if you give her her due.