2 definitions by mikey fo sho

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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