Green’s Dictionary of Slang

bat n.6

[pun on stick n. (6d)]

a marijuana or hashish cigarette.

[US] in Spears Sl. and Jargon of Drugs and Drink (1986).
[US]K. Shea ‘Having Chiqui’ in ThugLit July-Aug. [ebook] [A] bat Muzz carried around for the occasional nerve-calming quick hit.