Green’s Dictionary of Slang

(US black) on bad = good pattern, first-rate, attractive.

1936		A.E. Duckett ‘Truckin ’round Brooklyn’ in N.Y. Age 18 Jan. 7/1: Brooklyn at last has a really pretty ballroom...the Bedford Palace... [...] the setup is very tricky, indeed.
1937		Duckett & Staple ‘Double Feature’ in N.Y. Age 15 May. 7/2: He walked in with another tricky miss.