Green’s Dictionary of Slang

1. (drugs) to mix two drugs together to create a greater level of enjoyment.

1968

‘Sl. of Watts’ in Current Sl. III:2.

2. (drugs) to improve the quality of a batch of marijuana; methods include steeping it in rum or some other spirit, placing it in the deep freeze, mixing it with another variety of marijuana or some other drug and so on.

1969		R.R. Lingeman Drugs from A to Z (1970).
1971		E.E. Landy Underground Dict. (1972).

3. (US drugs) to heat hashish so that it is easier to crumble and thus use in a cigarette or pipe.

2008

Stoners’ Dict. 🌐 Cure [US] – To heat hash so that it’s easier to crumble and make a joint with.