Green’s Dictionary of Slang

(US black) white; pertaining to white culture.

1949

Dan Burley ‘Back Door Stuff’ 29 Jan. [synd. col.] Witht eh Shoreham, Roosevelt and Commodore, plus the other ‘buttermilk’ hostelries full of the folks who built ’em, the Whitelaw [a black-financed, designed and occupied apartment-hotel] did land-office business.