Green’s Dictionary of Slang

dumper n.3

[one who should be thrown into a SE dumpster, a large rubbish container or skip]

(US) an ageing prostitute, i.e. over 40.

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D. Schulz Pimp 16: So the girls working 14th Street...almost all of them are drug addicts, and quite a few of them are dumpers, old women over forty [HDAS].

SE in slang uses

In phrases

in the dumper

1. out of favour, rejected, thrown away.

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[UK]Guardian 8 Sept. 🌐 Robinson believes that a comeback is plausible. ‘In the 90s Madonna was in the dumper, making quite bad records, and that’s been completely written out of her history,’ he pointed out.

2. lost, ruined, good for nothing.

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G.M. Ford Who in Hell is Wanda Fuca? 53: If all women looked like this one, makeup and fashion sales would go in the dumper.
[US]D. Morse ‘The war at home’ S.F. Examiner 30 Sept. 🌐 Airlines are going bankrupt left and right, still not having recovered from 9/11, and the stock market is in the dumper.