Green’s Dictionary of Slang

(US) one who has succeeded, one who has risen from immigrant poverty to material success, esp. of New York Jews; thus Allrightnik’s Row, Riverside Drive, home at one time of many successful Jews.

1916		E.H. Lewis Those about Trench 53: Marcus was what is technically known as an ‘allrightnik.’ He united a profound veneration for antiquity with an insolent adequacy in the clothing business.
1919		Mencken Amer. Lang. 156: Allrightnick means an upstart, an offensive boaster.
1929		S. Ornitz Haunch Paunch and Jowl 283: So here we live in Allrightniks Row, Riverside Drive [...] The Ghetto called anyone who was well off – one who is all right in this world, that is, well fixed – an Allrightnik.
1936		M. Levin Old Bunch (1946) 184: All the landlords they had ever had, the allrightniks to whom rent had to be paid.
1951		(con. 1910s) S. Longstreet Pedlocks (1971) 210: He was proud of her there in that cellar dive among all the fancy allrightniks.
1975		S.J. Perelman letter 7 Aug. in Crowther Don’t Tread on Me (1987) 309: The Tel Aviv Hilton is a nightmare [...] full of the same all-rightnicks.
1979		G. Wolff Duke of Deception (1990) 12: Dr Wolff, an alrightnik with soft brown eyes and an appetite for excellence.
1992		T. McArthur Oxford Companion Eng. Lang. 1141/1: A number of American Yiddish innovations, such as allrightnik and boychik, have found their way into colloquial AmE.