Green’s Dictionary of Slang

jumping cat n.

[jumping adj.2 + cat n.5 (1)]
(US black)

1. a sophisticated, poised older person.

[US]R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].

2. anyone successful in their occupation, legitimate or criminal.

[US]R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].