Green’s Dictionary of Slang

1. hedonistic, luxurious.

1918		implied in lush up v. (1)
1946		H.A. Smith Rhubarb 20: There’s a sloppy at Bonwit’s and Myra yearns for it. It’s zoomy! It’s groovy! It’s beauteous! It’s lush! It’s eighteen bucks!
1957		H. Simmons Corner Boy 155: It’s lush life for you now, isn’t it, lady?
1960		C. Cooper Jr Syndicate (1998) 6: Talk about a lush joint, Lilly’s was the most.
1984		Eble Campus Sl. Sept.

2. wealthy.

1935		in Amer. Mercury June 230: Lush: prosperous [HDAS].
1944		C. Himes ‘Let Me at the Enemy’ in Coll. Stories (1990) 40: A lotta cats [...] slip up here an’ cop this slave sayin’ they goin’ east an’ come back all lush.
1952		Lait & Mortimer USA Confidential 12: These were lush days for the boys, while they were making billions in legal liquor, extortion, labor rackets, etc.