Green’s Dictionary of Slang

ball v.4

[ball n.1 (6)]

(UK/US black) to play basketball.

[US]Da Bomb [Internet] 2: Balling: Playing well (usually in basketball).
Online Sl. Dict. [Internet] ball v 1. to play basketball. (‘I was balling with some friends yesterday.’).
[US]G. Pelecanos Night Gardener 58: Ronald and Richard Spriggs were tough, but they couldn’t ball. Diego and Shaka took every game.
[UK]A. Wheatle Crongton Knights 3: Gs spent their time [...] balling in open-air basketball courts.