Green’s Dictionary of Slang

chump v.

[chump n. (3)]

1. (also chump out) to trick, to deceive, to make a fool of someone.

[US](con. 1920s) J. Thompson South of Heaven (1994) 146: You had to be chumped for murderin’ Bud.
[US]Current Sl. V:3.
[US]A. Rodriguez Spidertown (1994) 82: If I’m so important, why he chump me out by throwin’ me inna car fulla psycho cops, man?

2. (US black) to act like a fool, to be exploited.

[US]‘Iceberg Slim’ Pimp 210: They know in their sucker tickers they’re chumping.

In phrases

chump off (v.) (US black)

1. to lose money irresponsibly.

[US]E. Anderson Hungry Men 241: ‘Where did you get those tailor-mades?’ [...] ‘I chumped off.’.
[US]‘Iceberg Slim’ Mama Black Widow 164: He got trimmed in a blackjack game [...] All them whores got in the wind when they got hip how he chumped off.

2. to dupe.

[US]C. Cooper Jr Farm (1968) 103: I never could figure how I chumped myself off on something like that.
[US]W.D. Myers It Ain’t All for Nothin 118: ‘[T]hey try to get next to another guy’s kids and then chump him off by being nice’.
[US]J. Stahl Bad Sex on Speed 138: The two plain-looking gentlemen hipsters head down Broadway, chumping off you-know-who.

3. to defeat in a verbal battle.

[US]D. Claerbaut Black Jargon in White America 60: chump (you) off v. to verbally defeat someone; to get the better of one in a battle of words.
[US]W.D. Myers Hoops 44: ’’What did you ever do for your own people?’ Paul asked. That got me mad because I felt I was being chumped off .

4. to act like a fool.

[US]‘Iceberg Slim’ Airtight Willie and Me 81: I swore a thousand times I’d never chump off my life in a steel mill like my old man.

5. (US black) to reject, to dismiss, to cause someone to depart or to abandon an activity.

[US]W.D. Myers Hoops 105: I’d say they chumped me off so they could let some white boy on the team.
[US]W.D. Myers Scorpions 158: ‘I think he looking for a way to chump me off so he can take over the Scorpions’.
[US]W.D. Myers ‘Kitty and Mack: A Love Story’ in 145th Street 88: ‘I want to lead my life the way I want to lead it without you or anybody else telling me what I need to do [...] ’ ‘I guess that’s supposed to chump me off, right?’ .

6. to look down on, to disdain.

[US]R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].
chump (someone) down (v.) (also chump (someone) off)

(US black) to humiliate someone.

[US]W.D. Myers Hoops 70: ‘You can’t say this to them and you can’t say that to them because they think you’re chumping them off in front of their woman’.
[US]N. McCall Makes Me Wanna Holler (1995) 68: I’d publicly chumped him down.
[US]J. Lerner You Got Nothing Coming 187: Sergeant Stanger tells me you chumped him off in front of the assistant warden.
[US]J. Stahl Pain Killers 129: When I found out I felt chumped off.