Green’s Dictionary of Slang

jigger n.2

[the sufferer jigs with the pain]

(UK Und.) a whipping post.

[UK]Hell Upon Earth 5: Jigger, a Whipping-Post.
[UK]Grose Classical Dict. of the Vulgar Tongue ms. additions .
[UK]Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn) n.p.: Jigger, A whipping post.
[UK]Lex. Balatronicum [as cit. 1788].
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.