Green’s Dictionary of Slang

1. (US) to play basketball.

1981		W.D. Myers Hoops 14: Most of the guys I had been playing with [...] most of my life, and I knew they could hoop .
1982		W. Safire What’s the Good Word? 213: To ‘hoop out’ is to play basketball, but actually playing is ‘hooping down’ [HDAS].
1987		Eble Campus Sl. Oct. 3: hoop it – play basketball.
1988		Rage 30 Mar. 19: He has a pair of Nike Air Revolutions and can’t hoop a lick! [HDAS].
1990		W.D. Myers Mouse Rap 3: You know I can run, you know I can hoop / I can do it alone, or in a group.

2. see hoof v. (2)