Green’s Dictionary of Slang

twig v.1

[? SE tweak or twitch]

1. of a man, to have sexual intercourse [SE twig, to do something vigorously].

[UK]‘Second Libel of Oxford’ in May & Bryson Verse Libel 374: But sure the old boare he hath twigg’d / A sow or two.

2. to disengage, to break off.

1725
1750180018501900
a.1904
[UK]New Canting Dict. n.p.: To Twig, to disingage, to sunder, to snap, to break off.
[UK]Bailey Universal Etym. Eng. Dict. [as cit. 1725].
[UK]B.M. Carew Life and Adventures.
[UK]Grose Classical Dict. of the Vulgar Tongue n.p.: Twig, [...] to disengage, snap asunder, or break off. To twig the darbies; to knock off the irons.
[UK]Lex. Balatronicum [as cit. 1785].
[UK]Farmer & Henley Sl. and Its Analogues.

3. (UK Und.) to hit.

[UK]H. Smith Gale Middleton 1 158: Damn the leary cove! the wind isn’t out of him yet. Twig him another crack, Jem!

In phrases

twig the darbies (v.)

(UK Und.) to knock off the handcuffs or irons.

1725
173017401750176017701780179018001810
1811
[UK]New Cant. Dict. n.p.: To twig the Darbies, to knock off the Irons.
[UK]Grose Classical Dict. of the Vulgar Tongue n.p.: Twig, [...] to disengage, snap asunder, or break off. To twig the darbies; to knock off the irons.
[UK]H.T. Potter New Dict. Cant (1795) n.p.: to twigg the darbies to knock off the irons.
[UK]Lex. Balatronicum [as cit. 1785].
twig the heel (v.)

(US) to seduce.

[US]Wkly Rake (NY) 18 June n.p.: the rake advises [...] The man who says he will ‘twig the heel’ of a respectable and pretty girl in Cannon street to beware of a cowhiding from A.H .