Green’s Dictionary of Slang

1. to work as a street trader, esp. with overtones of illegality; thus spivvery/spivving n., working as a street trader.

1947		Times 18 Nov. 2/4: Instead of that brave new Britain all they had left was a land fit for bookies to spiv in.
1956		‘Charles Raven’ Und. Nights 116: It did divert him from straight crookery to various forms of casual spivvery on the border-line between work and crime.
1989		in G. Tremlett Little Legs 3: He was into [...] totting, going on the knocker, spivving.

2. (also spiv around) to trick, to deceive.

1952		M. Allingham Tiger in the Smoke 73: There were two courses open to him. He could spiv around with an army of accountants, looking for loopholes in the law, or he could gamble on the exchange.
2011		J.J. Connolly Viva La Madness 400: I get the idea that you’re all spivving me.