An individual who is addicted to narcotic drugs like heroin, morphine, oxycodone (OxyContin/Percocet), hydrocodone (Vicodin), or other opioids, but can still maintain a normal and successful life.
A functional junkie is a person that can have a family, have a successful career, successful education, and maintain relationships, as long as they have their dope, because once they don't have it, then everything spirals out of control.
by TJM91 June 18, 2009
A person who uses drugs for an unrecreational purpose but can still operate normally at work or at school
MAN1:That man is a total functional junkie

MAN2:What's that?

MAN1: Some dude who does drugs but still has a good-paying job
or does good at school and can still function normally.
by mikey fo sho May 13, 2007

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