Green’s Dictionary of Slang

to fellate; to perform frottage with the armpit.

1699		N. Ward London Spy VII 153: You couple of Treacherous sons of Brideswell B—s, who are Pimps to your own Mothers, Stallions to your Sisters, and Cock-Bawds to the rest of your Relations; who were begat by Huffling, Spew’d up, and not Born; and Christen’d out of a Chamber-Pot.
1709		J. Spinke Quackery Unmask’d 28: Huffling and Buggery.
1744		Machine 11: Selfish Letcher that does Jesuit box, / Or Huffling, Gigging, Semigigging, Larking, / Or that queer Practice, by the Cull call’d Barking.
1785		Grose Classical Dict. of the Vulgar Tongue n.p.: Huffle, to huffle, a piece of bestiality too filthy for explanation.