Freebase cocaine, also known as crack, is a smokable version of cocaine. It can be placed into a crack pipe and smoked using convection, not requiring heat to touch the material; the user then inhales and holds the smoke, experiencing intense euphoria that can rival IV cocaine. This lasts about 5 minutes, after which the user generally experiences depression and irritability. People addicted to Freebase cocaine are called 'basers'.
It's a hell of a drug.