freebasing

Verb

freebase (third-person singular simple present freebases, present participle freebasing, simple past and past participle freebased)

1. To purify a drug by crystallization.
2. To use a purified drug, especially cocaine, by heating it and inhaling the fumes produced.
   • Richard, one of my friends in L.A., claimed to have invented freebasing— smoking cocaine in its base form—though it's likely that what he meant was that he introduced a whole bunch of people to the process.2009, Mackenzie Phillips, High On Arrival, page 82

See all 4 meanings of freebase