Green’s Dictionary of Slang

rig n.1

[? SE rig, to play the wanton, to romp about; ult. ety. unknown]

1. a wanton, promiscuous woman.

[UK]‘Mr. S’ Gammer Gurton’s Needle in Whitworth (1997) III iii: Nay, fie on thee, thou ramp, thou rig.
[UK]E. Guilpin Skialetheia Satire III n.p.: My Muse shall play the rig Once in her dayes, but shee shall quittance thee .
[UK]J. Davies of Hereford Wittes Pilgr. in Works II 49/2: The most voluptuous ouer-wanton Rigge, Proud Plentie, scornes meeke Pieties Woman-hood .
[UK] ‘A Pleasant Country Maying Song’ in Rollins Pepys Ballads (1929–32) This pretty maiden waxeth big: / See what ’tis ti play the Rig.
T. Fuller Pisgah sight of Palestine (1869) 539: Let none condemn them for Rigs, because thus hoiting with boys .
[UK]Motteux (trans.) Pantagruelian Prognostications (1927) II 694: Those whom Venus is said to rule [...] light skirts, wrigglers, misses, cats, rigs.
[UK]Duke of Montague quoted by Theodore Hook in Odd People ‘An Honest Practical Joke’ n.p.: Now all my wig-singeing, and nose-blacking exploits, will be completely outdone by the rig [that was the favourite word in the year 1739] I shall run upon this unhappy devil with the tarnished lace [F&H].
[UK] ‘O Can Ye Labour Lee, Young Man?’ in Farmer Merry Songs and Ballads (1897) II 259: A stibble rig is easy plough’d / The fallow land is free.
[UK] ‘The Blue Lion’ in Holloway & Black (1975) I 31: Such songs, such gigs, such flashy rigs.
[UK] ‘Hurrah For An Irishman’s Sprig!’ in Cockchafer 20: Adam was an Irish man, / And Eve, as we twig, / Only notice the rig, / She was made from an Irishmnan’s sprig!

2. a smart, ‘sharp’ young man.

H. Lemoine ‘Education’ in Attic Misc. 116: At ev’ry knowing rig, in ev’ry gang, / Dick Hellfinch was the pink of all the slang.
[UK] ‘Sonnets for the Fancy’ in Egan Boxiana III 621: A very knowing rig in ev’ry gang, / Dick Hellfinch was the pick of all the slang.

In derivatives

riggish (adj.)

lecherous, amorous, lascivious.

[UK]P. Levins Manipulus Vocabulorum 145/38: Riggish, licentious.
[UK]Shakespeare Antony and Cleopatra II ii: For vilest things Become themselves in her, that the holy priests Bless her when she is riggish.
[UK]W. Kenrick Falstaff’s Wedding (1766) II ix: dol: Give me a buss. fal.: Go, Dol, you are riggish.
[UK]Armagh Guardian 21 June 8/1: It cannot be absolutely necessary, in order to attain a good and respctable old age, to be riggish or jiggish.
[UK]‘Walter’ My Secret Life (1966) VII 1391: Voluptuousness, lickerishness, ruttish, riggish, stupration and harlotry, all words found in the dictionary, and all of which I suppose may be classed under the term erotic.

In phrases

go the rig (v.)

(UK Und.) to enjoy oneself.

[UK]Swell’s Night Guide 68: Aye, she lagged him for his life! ‘Now,’ said she ‘the bloak has gone in for a buster; he’s been out for many a pelter, so now ve can go the rig.’.