Green’s Dictionary of Slang

plush n.

[SE plush, a type of cloth, softer than velvet, used for expensive garments, seat covers etc.]

1. female pubic hair [note Ital. peluccio, peluzzo, a little hair, soft down, fine hair].

[UK]‘Affairs in Greece’ in Boudoir II 54: John grew quite bold, he'd had some lush, / And began to finger cookey's plush.
[UK]Farmer & Henley Sl. and Its Analogues.

2. (orig. RN) profit, money .

[[UK]W.N. Glascock Naval Sketchbk I 27: ‘I’ll bet you,’ says he, ‘aye, six months’ pay to your plush’ ‡ [note] ‡ On board a man-of-war, the cooks of the messes have a perquisite of the overplus grog that may remain in the ‘kid’ or can, after the cup has gone round].
[[UK]Navy at Home II 201: The captain of the forecastle [...] whom he had propitiated with a full horn of plush, (surplus)].
[UK]London Standard 27 Jan. 6/3: A kind of middle-men, who contract with the masters for a given amount of work, which they get done as cheaply as possible, and pocket the ‘plush’.
[US]Ade ‘The New Fable of the Private Agitator’ in Ade’s Fables 14: Money will creep out of the Yarn Stockings and a few Wise Gazabes will cop all the Plush.

SE in slang uses

In phrases

on (the) plush (adv.)

in luxury.

[US] ‘The Bum on the Rods and the Bum on the Plush’, in N. Anderson Hobo 202: The bum on the plush is a social leech.
[US]W. Edge Main Stem 12: We should stick together, fellow workers [...] and get rid of the bums on the plush (the idle rich).
[US]G. Milburn ‘The Two Bums’ in Hobo’s Hornbook 120: The bum on the rods is a social flea / Who gets an occasional bite, / The bum on the plush is a social leech, / Blood-sucking day and night.
[US]Monteleone Criminal Sl. (rev. edn) 37: bum on the plush A member of the idle rich.
[US]Ragen & Finston World’s Toughest Prison 811: on the plush – Any state of comfort, wealth or ease.
sit in the plush (v.)

to live in luxury.

[[UK]Framlingham Wkly News 30 Mar. 2/6: I don’t like to sit buried in plush in the waiting parlour].
[US](con. 1910s) J.T. Farrell Young Lonigan in Studs Lonigan (1936) 13: He was not exactly sitting in the plush on Easy Street.
[US]N. Algren Neon Wilderness (1986) 71: I never set on plush in my life.