Green’s Dictionary of Slang

a bore, a teller of long and tedious stories with neither end nor point.

1627		J. Taylor ‘An Armado’ in Works (1869) I 80: Lawrence Delay the Paymaster; kinsman to Tom Long the Carrier.
c.1698		B.E. Dict. Canting Crew n.p.: Come by Tom Long the Carrier, of what is very late, or long a coming.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Tom long, A tiresome story teller. It is coming by Tom Long, the carrier; said of any thing that has been long expected.
1811		Lex. Balatronicum [as cit. 1785].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.