Green’s Dictionary of Slang

1. (US black) a light-skinned black person, thus any person of colour.

1944		‘Jiver’s Bible’ in D. Burley Orig. Hbk of Harlem Jive.
1948		Dan Burley ‘Back Door Stuff’ 6 Nov. [synd. col.] He is the first of the beiges to be accepted on the Central Planning Board.
1960, 1975		Wentworth & Flexner DAS.
1988		A. Hollinghurst Swimming-Pool Library (1998) 202: I thought you must be down here after a bit of beige. That’s what most of the white guys come here for.
2002		‘Touré’ Portable Promised Land (ms.) 151: We Words (My Favorite Things) [...] My people, my people... Yes, yes, y’all. Eight-ball-black. Brown. Bronze. Beige. Ebony.

2. (UK Black/drugs) crack cocaine or heroin.

2015		M. Dargg ‘Upsuh’ 🎵 The kittys are calling they’re catting the beige.
2015		410 ‘Civilians’ 🎵 Beige all lookin like Fufu / Brown just lookin like grandma.