Green’s Dictionary of Slang

to trick, to fool, to lie.

1812		Vaux Vocab. of the Flash Lang. in McLachlan (1964) 280: wrinkler a person prone to lying; such a character is called also a gully, which is probably an abbreviation of Gulliver, and from hence, to gully signifies to lie, or deal in the marvellous.
1848		Thackeray Vanity Fair I 70: I’ll gully the dag and bimbole the clicky in a snuffkin.