Green’s Dictionary of Slang

a worn-out old prostitute.

1749		Fielding Tom Jones (1959) 124: Indeed, if I was as Mr Jones, I should look a little higher than such trumpery as Molly Seagrim.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.