A person that has an addiction whether it be to alcohol or drugs and still able to maintain a "normal" life.
My boyfriend is a functioning addict. He can drink from the time he wakes up until the time he goes to bed and still is able to go to work.
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A functioning crackhead is somebody that is able to hold down a job and maintain a "normal" lifestyle while on crack, without completely sucumbing they're life to the drug.
Guy 1: For a hype, that dude sure has a decent house and job.
Guy 2: Yeah, thats because he's a functioning crackhead
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