Green’s Dictionary of Slang

1. a state of drunken or drugged intoxication.

1955		E. Hunter ‘See Him Die’ in Jungle Kids (1967) 99: I think he’s got some weed on him. Then I see he ain’t fixing to gather a stone.
1967		Oz 7 26/2: We’ll all loon off to Lord Mudley’s castle for a groovy communal stone.
1982		G. Newbold Big Huey 15: Two to three hundred milligrams of pethidine gives a good stone.
1997		L. Davies Candy 24: I closed my eyes and enjoyed the stone.

2. (N.Z. prison) a marijuana cigarette.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 178/2: stone n. a cigarette containing marijuana.