Synonyms for Chalk (same or very similar meaning)
WordNet sense 1 (an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant):
crank, glass, ice, methamphetamine, trash, chicken feed, deoxyephedrine, meth, Methedrine, shabu, methamphetamine hydrochlorideFrom the ODE community, based on WordNetadd/edit