Green’s Dictionary of Slang

1. severely beaten or thrashed.

[1680		Crack upon Crack 4: [Citt claws him off with his cat of Nine-Tails]].
c.1698		B.E. Dict. Canting Crew n.p.: Claw’d-off, lustily lasht.
1721		Penkethman’s Jests 111: As for the Leg, the Cook ought to be claw’d off for not roasting it enough.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Clawed off, severely beaten or whipped; also smartly poxed or clapped.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1890–1904		Farmer & Henley Sl. and Its Analogues.

2. suffering from a venereal disease.

c.1698		B.E. Dict. Canting Crew n.p.: Clawed off [...] swingingly Poxt.
1725		New Canting Dict.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.

an early version of the 20C+ scratch my back and I’ll scratch yours.

1539		R. Taverner (trans.) Proverbes or Adages by Erasmus (1569) 61: Claw me, claw thee. Beare witnes with me, and I will beare witnes with thee.
1546		J. Heywood Proverbs I Ch. xi: Ka me, ka thee, one good tourne askth an other.
1595		Maroccus Extaticus C2: For hee will forbeare as long as shee will beare, and thats ka mee, and ka thee, knaue he, and queane she.
1605		Chapman & Jonson Eastward Ho! II ii: ‘Ka me, ka thee’, runs through court and country.
1611		L. Barry Ram-Alley IV i: Women please men, men pleasure them againe, Ka me, ka thee, one thing must rub another [...] You know the law has trickes, ka me, ka thee.
1615		Merrie Dialogue Between Band, Cuffe, and Ruffe B3: Claw me, and I’ll claw thee, the proverb goes.
c.1629		R. Brome City Wit IV i: Ka me, Ka thee, an old kind of Courtship.
1633		Massinger Guardian II i: As my Masters monies come in, I do repay it, Ka me, ka thee.
1709		N. Ward Compleat and Humorous Account of Remarkable Clubs (1756) 313: Yet their own Works sometimes should be blushingly repeated, that they might have a friendly Opportunity of tickling each other with reciprocal Flattery, and put that Policy in Practice; so much in Vogue among scabby Friends, viz. I’ll scratch you, you do scratch me.
1738		Swift Polite Conversation 85: lady sm.: Well, she and Tom Gosling were banging Compliments backwards and forwards. It look’d like two Asses scrubbing one another. miss.: Ay, claw me, and I’ll claw thee.
1822		R. Nares Gloss. (1888) II 477: ka me, and i’ll ka thee, prov., or more commonly, in an abbreviated form, ka me, ka thee. [...] swear for me, and I’ll do as much for you; or claw me and I’ll claw you.

to thrash, to beat severely; thus clawed off

1725		New Canting Dict.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1821		R. Waln Hermit in America on Visit to Phila. 2nd series 25: My attention was soon attracted by the voices of the players. [...] ‘Don’t claw off, Bill’—‘That’s a cooler’—‘Don’t crow yet’.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1856		Northampton Mercury 19 Apr. 3/1: Some people clawed him off.

see grab (the) sky under grab v.