coker, n.¹ — Green’s Dictionary of Slang

coker n.¹

[caulker n. (2), but chronology suggests this (or at least this sp.) may have been the orig. term]

1. a liar.

1665, 1680

2. a lie.

1674		Head Canting Academy (2nd edn).
c.1698		B.E. Dict. Canting Crew.
1707		J. Shirley Triumph of Wit.
1725		New Canting Dict.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict.
1754		Scoundrel’s Dict. 18: Lye – Coker.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.