Crankster - person who uses or manufactures methamphetamine
Crap/crop - low quality heroin
Crash - sleep off effects of drugs
Crazy coke - PCP
Crazy Eddie - PCP
Crazy weed - marijuana
Credit card - crack stem
Crib - crack
Crimmie - cigarette laced with crack
Crink - methamphetamine
Cripple - marijuana cigarette
Cris - methamphetamine
Crisscross - amphetamine
Criss-crossing - the practice of setting up a line of cocaine nect to a line of heroin. The user places a straw in each nostril and snorts about half a line each. Then the straws are crossed and the remaining lines are snorted.