A drug addict, especially a person addicted to injecting drugs.
Example sentencesExamples
There were occasions when I, the former needle man, got to employ the skill set of my old habit by injecting my mother with various injectables.
The only way I take any pills is by mouth - I'm not a needle man.
Howard was a needle man — that is, a hopeless drug addict.
Except for the four card players and the needle man, all were doing absolutely nothing, not even talking.
That such an injection (no pun intended; he wasn't a needle man) was often fueled by a cocktail of drugs and alcohol that would fell a herd of rhinos is beside the point.