What is the meaning of Shabu?

Methedrine; methamphetamine.

Alternative form of sabu (methedrine; methamphetamine)

Rōmaji transcription of しゃぶ

Rōmaji transcription of シャブ

methedrine; methamphetamine; crystal meth

ya ba (tablet containing a mix of methamphetamine and caffeine)

Source: wiktionary.org