Green’s Dictionary of Slang

1. (US Und.) to pickpocket; thus whizzing adj.

1926		N. Lucas London and its Criminals 20: To his ‘whizzing’ pals he is known as ‘Izzy’. [Ibid.] 21: I thought someone was trying to ‘whiz’ me.
1939		Howsley Argot: Dict. of Und. Sl. 54: whizz – to pick a pocket.
1946		S. Jackson Indiscreet Guide to Soho 119: He helps you off with your coat and ‘whizzes’ your wallet or watch at the same time [...] Scores of men have been ‘whizzed’ in Soho public lavatories.
1950		Goldin et al. DAUL 236/2: Whiz, v. To pick pockets.
1982		in J. Ciardi Good Words (1987) 218: Whiz. The practice of picking pockets.
1989		J. Morton Lowspeak.

2. to steal.

1960		‘Nino Culotta’ Cop This Lot 189: Go back an’ keep an eye on the suitcases [...]. Anybody could walk into our carriage an’ wizz ’em orf.
1962		C. Rohan Delinquents 60: I’ll go over and collect your bottle otherwise some thirsty bum will whizz it off.
1984		‘Derek Raymond’ He Died with His Eyes Open 42: It’s all right. I won’t whizz anything.

3. (UK drugs) to take any form of amphetamine drug; thus whizzing n.

2002

J. Cameron Hell on Hoe Street 80: You never did want school agg after a hard bit of weekend whizzing.