Green’s Dictionary of Slang

1. to cuckold.

1702

T. Brown ‘Letters from the Dead to the Living’ in Works (1707) II 168: Believing for some Reasons he had an underhand Design of liquoring his boots for him .

2. to drink before leaving on a journey.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1862		E. de la Bédollière Londres et les Anglais 316/1: to liquor one’s boots, boire le coup de l’étrier.