Green’s Dictionary of Slang

whiz n.4

also whizz, wiz, wizz
[SE whiz, to move fast]

1. constr. with the, the occupation of pickpocketing.

implied in on the whiz(z)
[UK]F.D. Sharpe Sharpe of the Flying Squad 329: ‘The Wizz’ – the term which describes the art of picking pockets.
[US]Goldin et al. DAUL 236/2: Whiz, the. The pocket-picking profession.
[Aus]J. Alard He who Shoots Last 47: He was a master of the wiz, or master dip.
[UK]D. Powis Signs of Crime 207: Whiz, the The craft of the pickpocket: ‘Tom has been at the whiz these last ten years at least.’.

2. a pickpocket.

[US]‘Goat’ Laven Rough Stuff 110: Georgie the Jap who is known throughout America as the cleverest whizz in the country.
[US]Monteleone Criminal Sl. (rev. edn) 252: whiz Lookout for pickpockets whizz A pickpocket at work.
[US]Goldin et al. DAUL 236/2: Whiz, n. A pickpocket.

3. amphetamine, amphetamine sulphate.

[UK]N. Barlay Curvy Lovebox 24: Burnt out on whizz.
[UK]J. Poller Reach 111: I find Patricia chopping up monster lines of whizz with her Barclaycard.
[Scot]C. Brookmyre Be My Enemy 98: No stranger to posh or whizz when he needed an eighteen- [...] hour session at the computer.

In compounds

whiz artist (n.) (also whizz artist) [-artist sfx]

a pickpocket.

[UK]A. Baron Lowlife (2001) 90: ‘Put your money away, before one of the whizz artists decides to take it off you. Come on.’ ‘Whizz artists?’ ‘Pickpockets.’.
whiz boy (n.) (also whizz boy)

a pickpocket.

[UK]P. Allingham Cheapjack 240: ‘Whizzboys,’ I knew, meant ‘pickpockets.’.
whiz mob (n.) (also whiz gang, whizz mob, wizz mob) [mob n.2 (3)]

a team of pickpockets.

[Aus]Gippsland Times(Vic.) 29 Jan. 3/2: Gangs of pickpockets are called ‘whizz mobs’.
G. Dilnot Triumphs of Detection 47: A ‘wizz mob’ which operated [...] at Hammersmith Broadway.
[UK]J. Curtis Gilt Kid 279: ‘George King, just surrendered to his bail on a charge of being a suspected person loitering in the neighbourhood of Baker Street Tube Station with the intention of picking pockets.’ ‘Didn’t know you was in a whizz mob, Kingy.’.
[UK]V. Davis Phenomena in Crime 208: The ‘pick-up’ gangs and the ‘whizz mobs’ are kindred racketeers.
[US]Monteleone Criminal Sl. (rev. edn) 252: whiz gang A pickpocket gang or mob.
[UK]F. Norman in Sun. Graphic 23 Nov. in Norman’s London (1969) 39: He had once been a very prominent member of a highly respected whizzmob.
[UK](con. 1920s) J. Sparks Burglar to the Nobility 28: What do you want me to do [...] go picking pockets with a whizz-mob?
[UK]G.F. Newman You Flash Bastard 157: Guv – they made a nice show with that whiz-mob.
whizz man (n.)

(Aus. Und.) a confidence trickster.

[Aus]Smith’s Wkly (Sydney) 2 Dec. 18/1: All sorts and conditions of crooks take part in the great trek — ‘whizz’ men, ‘broad-tossers,’ ‘shell’ wroughters, ‘Jack’ spinners; all are there.
[Aus]Sun. Mail (Brisbane) 13 Nov. 20/8: The men who worry the police most are the ‘whizz’ or ‘con.’ men.

In phrases

on the whiz(z) (also at the whiz(z), doing the whizz, on the wiz)

working as a pickpocket.

Jackson Dly News (MS) 1 Apr. 7/1: Crook Chatter [...] ‘Fresno Phil flew me a kite last week sayin’ they was a dozen raps against me for “throwin a hump” for him in St Louis. I was only on the “whizz” in that town once in my life’.
[UK]E. Jervis 25 Years in Six Prisons 17: Some of the boys are ‘on the whiz’ (pickpockets), or ‘go screwing’ (burglars) or ‘telling the tale’ (confidence trick) or ‘tweedling.’.
[US]‘Goat’ Laven Rough Stuff 110: One day while I was strolling along the pier I ran into two of the best pickpockets, that is men on the whizz, in the country.
[UK]Thieves Slang ms list from District Police Training Centre, Ryton-on-Dunsmore, Warwicks 1: At the whizz: Picking pockets [Ibid.] 4: Doing the whizz; picking pockets in a crowd.
[UK]J. Curtis Gilt Kid 244–5: They were, he knew, on the lookout for pickpockets [...] they might pinch him for being on the whizz.
[US]A.J. Liebling Back Where I Came From (1990) 22 1: There may be some old-timers who will go on the whiz again.
[US]Monteleone Criminal Sl. (rev. edn) 168: on the wiz Working at picking pockets.
[UK]P. Hoskins No Hiding Place! 189/1: At the Whiz. Pickpocketing.
[US] in J. Ciardi Good Words (1987) 218: On the whiz. Out plying the pickpocket’s trade.