Green’s Dictionary of Slang

gig v.3

[ety. unknown]

to hamstring (an animal).

H. Lemoine ‘The Clever Fellow’ in Wit’s Mag. 155/1: And always ready, prigs can tell, / To gig a Smithfield hank.
[UK]Grose Classical Dict. of the Vulgar Tongue n.p.: To gigg a Smithfield hank; to hamstring an over-drove ox, vulgarly called a mad bullock.
[UK]Lex. Balatronicum [as cit. 1785].
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[UK] in Egan Bk of Sports 146: And always ready, prigs can tell, / To gig a Smithfield hank.