Green’s Dictionary of Slang

(drugs) methamphetamine.

1999		Guardian G2 14 Sept. 3: Shabu [...] It’s Methamphetamine hydrochloride.
2000		Indep. on Sun. Rev. 28 May 15: Similar to the powdered drug shabu (ice).
2001		ONDCP Street Terms 19: Shabu — Ice; crack cocaine; methamphetamine; methylenedioxymethamphetamine (MDMA).