Green’s Dictionary of Slang

(orig. US black) a stuck-up, conceited, snobbish person.

1925		G.S. Schuyler Yellow Peril in Hatch & Hamalian Lost Plays of Harlem Renaissance (1996) 51: If that darky just brings that fur coat, I’ll knock ’em dead. Put on airs with me, will they? I’ll make all the dickties look like ragbags.
1928		C. McKay Home to Harlem 164: The educated ‘dick-tees,’ in Jake’s circles were often subjects for raw and funny sallies.
1928		R. Fisher Walls Of Jericho 8: Hyeh’s a dickty tryin’ his damndest to be fay – like all d’ other dickties.
1931		S. Brown ‘Tin Roof Blues’ in Botkin Folk-Say 117: Dudes and dicties, others strive to git dat way.
1946		Drake & Cayton Black Metropolis 521: People with slight education, small incomes, and few social graces are always referring to the more affluent and successful as ‘dicties,’ ‘stuck-ups,’ muckti-mucks,’ ‘high-toned folks, ‘tony people.’.
1947		Time 10 Feb. 12: I didn’t want to be a dicty [W&F].
1953		W. Fisher Waiters 169: I ain’t studyin’ these dicty’s in this house myself! he thought. These poor-ass folks puttin’ on airs over nothin’.
1958		Hughes & Bontemps Book of Negro Folklore 482: dicty : High hat, snooty. The dicties live on Riverside.