Green’s Dictionary of Slang

bender n.3

[bent adj. (5)]

1. (US Und.) a thief, a cheat.

[US] ‘Und. “Lingo” Brought Up-to-Date’ L.A. Times 8 Nov. K3: BENDER: A thief; cheater.
[US]‘Paul Cain’ Fast One (1936) 100: A couple of benders came in [...] They’d been waiting [...] to find out what they had to heist.
[US]Monteleone Criminal Sl. (rev. edn) 20: bender A thief; a cheater; a petty thief.

2. a stolen car.

[US]J.E. Hoover Persons in Hiding 247: This car’s a bender. One of your gang probably stole it.
[US]J. Evans Halo for Satan (1949) 123: It may be a bender.
[US]Mencken Amer. Lang. Supplement II 724: Bender, tomato or puppy. A stolen car.
[US]Monteleone Criminal Sl. (rev. edn) 20: bender [...] a stolen automobile.
M. Taylor in Spitalfields Life 1 Oct. 🌐 In those days, you had a lot of villains and benders came here, smart people. They all showed respect for each other.

3. a robbery.

[UK]N. Barlay Crumple Zone 182: Are we robbin’ gaffs up Chorleywood? Or just visting your auntie? — Jus’ visitin’ as it goes. You fink Ah’m gonna take you wiv me on a bender.