Green’s Dictionary of Slang

turnpike man n.

a parson.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Turnpike man, a parson; because the clergy collect their tolls at our entrance into and exit from the world.
1811		Lex. Balatronicum [as cit. 1785].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1846		D. Jerrold Mrs. Caudle’s Curtain Lectures 25: Going and dressing yourself up in an apron like a turnpike man – for that’s what you look like.