Green’s Dictionary of Slang

liquid n.

1. a dietary supplement containing furanon di-hydro.

[Can]Toronto Sun 31 Dec. 82: Gugliotta’s seizure probably was caused by an over-the-counter dietary supplement with furanon di-hydro in it. The substance, which has street slang names such as ‘water’ and ‘liquid,’ is supposed to encourage sleep and assist muscle recovery and growth.

2. phencyclidine.

[US]Bynum & Thompson Juvenile Delinquency 290: Wack, liquid or juice. P.C.P.